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Error when I edit the screen at runtime - Object reference not set to an instance of an object - LightSwitch V2

Locked Error when I edit the screen at runtime - Object reference not set to an instance of an object - LightSwitch V2

  • Friday, April 20, 2012 2:00 PM
     
     
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    Error when I edit the screen at runtime - Object reference not set to an instance of an object - LightSwitch V2

    see the recording of the error
    http://screencast.com/t/xe1Uginl

       

    All Replies

    • Friday, April 20, 2012 3:47 PM
       
       
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      You might try clearing the MEF cache as described here: http://social.msdn.microsoft.com/Forums/en-US/lightswitch/thread/99ce68e8-52b1-4bd5-b298-7f9159d18ff7

      I seem to recall having a similar issue with V1 that was fixed by clearing the cache.

      My Blog: dotnetlore.com Twitter: @DotNetLore

         
      • Friday, April 20, 2012 5:32 PM
         
         
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        Hi Jewel,

        I cleared the cache and restarted the pc, but now is giving this error message:

        The last change was not maintained successfully. Shut down the running application. Error: The running application uses a different version of application definition.

           
        • Friday, April 20, 2012 5:37 PM
           
           
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          Hmmmm... which version of visual studio did you clear the cache from?

          %LOCALAPPDATA%\Microsoft\VisualStudio\10.0\ComponentModelCache
          %LOCALAPPDATA%\Microsoft\VisualStudio\10.0\ManifestCache

          or

          %LOCALAPPDATA%\Microsoft\VisualStudio\11.0\ComponentModelCache
          %LOCALAPPDATA%\Microsoft\VisualStudio\11.0\ManifestCache

          My Blog: dotnetlore.com Twitter: @DotNetLore

             
          • Friday, April 20, 2012 5:42 PM
             
             
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            both
               
            • Friday, April 20, 2012 6:01 PM
               
               
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              Sorry, not sure what else to suggest.

              My Blog: dotnetlore.com Twitter: @DotNetLore

                 
              • Friday, April 20, 2012 6:12 PM
                 
                 
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                Thanks for the help :)

                   
                • Friday, April 20, 2012 10:31 PM
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                  Couple of questions:

                  1. Does this problem happen all of the time? Most of the time? Sometimes?
                  2. Does this problem only occur on this screen? Does it occur on other screens?
                  3. If you switch back to using the Standard shell and theme, does the same problem occur?
                  4. Just before you click the Save button, if you enable breaking on all exceptions (in VS, Debug->Exceptions...-> check on the Thrown check box next to Common Language Runtime Exceptions), what is the call stack (the call stack is one of the tool windows along the bottom of VS)? Be sure to uncheck this check box after you are done reporting the problem, otherwise you'll break into VS every time an exception occurs).

                  Justin Anderson, LightSwitch Development Team

                  • Marked As Answer by Marden LR Saturday, April 21, 2012 12:17 AM
                  • Unmarked As Answer by Marden LR Saturday, April 21, 2012 3:28 AM
                  •  
                     
                  • Saturday, April 21, 2012 12:17 AM
                     
                     
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                    Hi Justin,

                    1. Always happens on some screens

                    2. On some screens

                    3. I removed the cosmopolitam theme and shell put the Default theme and shell. the error stopped

                       
                    • Saturday, April 21, 2012 12:33 AM
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                      If you do the 4th point, that would really help us in determining what the problem is.

                      Justin Anderson, LightSwitch Development Team

                         
                      • Saturday, April 21, 2012 3:18 AM
                         
                         
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                        In call stack showing nothing, i try this form:

                        In Immediate window  show this :

                        System.Windows.Data Error: BindingExpression path error: 'ViewModel' property not found on 'System.Windows.Controls.ContentControl' 'System.Windows.Controls.ContentControl' (HashCode=45409538). BindingExpression: Path='ViewModel.IsCharacters' DataItem='System.Windows.Controls.ContentControl' (HashCode=45409538); target element is 'System.Windows.Controls.ContentControl' (Name=''); target property is 'IsEnabled' (type 'System.Boolean')..

                        System.Windows.Data Error: BindingExpression path error: 'ViewModel' property not found on 'ControlProperty:HeightSizingMode: ScreenLayout' 'Microsoft.LightSwitch.RuntimeEdit.Implementation.PropertyPage.ScreenDesignerPropertyEntry' (HashCode=42067500). BindingExpression: Path='ViewModel.IsRowResizableDisplayName' DataItem='ControlProperty:HeightSizingMode: ScreenLayout' (HashCode=42067500); target element is 'System.Windows.Controls.CheckBox' (Name='chkIsColumnResizable'); target property is 'AutomationProperties.HelpText' (type 'System.String')..

                        System.Windows.Data Error: BindingExpression path error: 'ViewModel' property not found on 'ControlProperty:HeightSizingMode: ScreenLayout' 'Microsoft.LightSwitch.RuntimeEdit.Implementation.PropertyPage.ScreenDesignerPropertyEntry' (HashCode=42067500). BindingExpression: Path='ViewModel.IsRowResizableDisplayName' DataItem='ControlProperty:HeightSizingMode: ScreenLayout' (HashCode=42067500); target element is 'System.Windows.Controls.CheckBox' (Name='chkIsRowResizable'); target property is 'AutomationProperties.HelpText' (type 'System.String')..

                        System.Windows.Data Error: BindingExpression path error: 'ViewModel' property not found on 'System.Windows.Controls.ContentControl' 'System.Windows.Controls.ContentControl' (HashCode=5814408). BindingExpression: Path='ViewModel.IsCharacters' DataItem='System.Windows.Controls.ContentControl' (HashCode=5814408); target element is 'System.Windows.Controls.ContentControl' (Name=''); target property is 'IsEnabled' (type 'System.Boolean')..

                        System.Windows.Data Error: BindingExpression path error: 'ViewModel' property not found on 'ControlProperty:HeightSizingMode: grid' 'Microsoft.LightSwitch.RuntimeEdit.Implementation.PropertyPage.ScreenDesignerPropertyEntry' (HashCode=8873741). BindingExpression: Path='ViewModel.IsRowResizableDisplayName' DataItem='ControlProperty:HeightSizingMode: grid' (HashCode=8873741); target element is 'System.Windows.Controls.CheckBox' (Name='chkIsColumnResizable'); target property is 'AutomationProperties.HelpText' (type 'System.String')..

                        System.Windows.Data Error: BindingExpression path error: 'ViewModel' property not found on 'ControlProperty:HeightSizingMode: grid' 'Microsoft.LightSwitch.RuntimeEdit.Implementation.PropertyPage.ScreenDesignerPropertyEntry' (HashCode=8873741). BindingExpression: Path='ViewModel.IsRowResizableDisplayName' DataItem='ControlProperty:HeightSizingMode: grid' (HashCode=8873741); target element is 'System.Windows.Controls.CheckBox' (Name='chkIsRowResizable'); target property is 'AutomationProperties.HelpText' (type 'System.String')..

                        Justin I withdrew the answer because it does not solve the problem, we solve the problem using the cosmopolitam theme
                        • Edited by Marden LR Saturday, April 21, 2012 3:30 AM
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                        • Monday, April 23, 2012 10:11 PM
                           
                           
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                          Hi Justin,

                          the above post can help? we will try to solve the problem? I will not switch to the default thema because it works with normal

                             
                          • Friday, April 27, 2012 7:27 PM
                             
                             
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                            Hi justin,

                            I trace the error with Fiddler, please take a look...

                            https://skydrive.live.com/redir.aspx?cid=a26b0b160575b0bc&resid=A26B0B160575B0BC!204&parid=A26B0B160575B0BC!202&authkey=!AFKab951DWt-1Lc

                               
                            • Friday, April 27, 2012 8:40 PM
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                              Here's what you need to do to get what I'm looking for:

                              1. Do the steps that would reproduce the problem except for the final step in reproducing the problem.
                              2. Go back to VS and check the Throw check box next to Common Language Runtime Exceptions in the Exceptions dialog.
                              3. Go back to the running application and perform the final step that reproduces the problem.

                              If the problem occurs (because as we have established, it is not consistent reproducible), you'll definitely see where it occurs. VS will break on the line that is throwing the exception. It might even show a No Source Code Available window, but that's fine. What is really important is that you'll probably see a popup like this:

                              and what I'm looking for is the information in this tool window:

                              You don't have to take a screenshot; you can just select all of the lines and copy them.

                              Justin Anderson, LightSwitch Development Team

                                 
                              • Saturday, April 28, 2012 1:13 AM
                                 
                                 
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                                Please what am I doing wrong?? http://screencast.com/t/avma4dlI
                                I can not see the call stack window exceptions!

                                   
                                • Saturday, April 28, 2012 1:22 AM
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                                  Maybe you need to have Just My Code disabled (do this right before the final step to reproduce the problem):

                                  1. In VS, Tools->Options...
                                  2. Select Debugging tree item
                                  3. Uncheck "Enable Just My Code (Managed only)"

                                  In also notice that you run into the "Object reference not set to an instance of an object" message three times. So if you could grab the call stack for each thrown exception, that would be really helpful.

                                  Justin Anderson, LightSwitch Development Team

                                     
                                  • Saturday, April 28, 2012 4:07 AM
                                     
                                     
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                                    Thanks for the help, here is the log of call stack,

                                    > System.ServiceModel.dll!System.ServiceModel.AsyncResult.End<System.ServiceModel.Channels.ClientPollingDuplexDispatcher.PollAsyncResult>(System.IAsyncResult result) + 0x166 bytes 
                                      System.ServiceModel.PollingDuplex!System.ServiceModel.Channels.ClientPollingDuplexDispatcher.PollAsyncResult.End(System.IAsyncResult result) + 0x36 bytes 
                                      System.ServiceModel.PollingDuplex!System.ServiceModel.Channels.ClientPollingDuplexDispatcher.EndPoll(System.IAsyncResult result) + 0x105 bytes 
                                      System.ServiceModel.PollingDuplex!System.ServiceModel.Channels.ClientPollingDuplexDispatcher.OnPollComplete(System.IAsyncResult result) + 0x98 bytes 
                                      System.ServiceModel.dll!System.ServiceModel.AsyncResult.Complete(bool completedSynchronously) + 0xbe bytes 
                                      System.ServiceModel.dll!System.ServiceModel.AsyncResult.Complete(bool completedSynchronously, System.Exception exception) + 0x1c bytes 
                                      System.ServiceModel.PollingDuplex!System.ServiceModel.Channels.ClientPollingDuplexDispatcher.PollAsyncResult.OnRequestComplete(System.IAsyncResult result) + 0x12f bytes 
                                      System.ServiceModel.dll!System.ServiceModel.AsyncResult.Complete(bool completedSynchronously) + 0xbe bytes 
                                      System.ServiceModel.dll!System.ServiceModel.Channels.HttpChannelFactory.HttpRequestChannel.HttpChannelAsyncRequest.OnGetResponse(System.IAsyncResult result) + 0x100 bytes 
                                      System.Windows.dll!System.Net.Browser.ClientHttpWebRequest.InvokeGetResponseCallback.AnonymousMethod__18(object state2) + 0x11 bytes 
                                      mscorlib.dll!System.Threading.QueueUserWorkItemCallback.WaitCallback_Context(object state) + 0x3e bytes 
                                      mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx) + 0x97 bytes 
                                      mscorlib.dll!System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem() + 0x5a bytes 
                                      mscorlib.dll!System.Threading.ThreadPoolWorkQueue.Dispatch() + 0x1b3 bytes 
                                      mscorlib.dll!System.Threading._ThreadPoolWaitCallback.PerformWaitCallback() + 0x5 bytes 
                                      [Native to Managed Transition] 
                                      [Appdomain Transition] 
                                      [Native to Managed Transition] 


                                      System.Windows.Browser.dll!System.Windows.Browser.HtmlPage.VerifyThreadAndEnabled() + 0x78 bytes 
                                      System.Windows.Browser.dll!System.Windows.Browser.HtmlPage.Window.get() + 0x18 bytes 
                                      Microsoft.Data.Services.Client.LightSwitch!System.Data.Services.Http.ScriptXmlHttpRequest.CreateInstance(string typeName, object arg, out System.Windows.Browser.ScriptObject request) + 0xac bytes 
                                      Microsoft.Data.Services.Client.LightSwitch!System.Data.Services.Http.ScriptXmlHttpRequest.CreateNativeRequest() + 0xfe bytes 
                                      Microsoft.Data.Services.Client.LightSwitch!System.Data.Services.Http.ScriptXmlHttpRequest.ScriptXmlHttpRequest() + 0x37 bytes 
                                      Microsoft.Data.Services.Client.LightSwitch!System.Data.Services.Http.XHRHttpWebRequest.IsAvailable() + 0x47 bytes 
                                      Microsoft.Data.Services.Client.LightSwitch!System.Data.Services.Http.WebRequest.UriRequiresClientHttpWebRequest(System.Uri uri) + 0x34 bytes 
                                      Microsoft.Data.Services.Client.LightSwitch!System.Data.Services.Http.WebRequest.Create(System.Uri requestUri, System.Data.Services.Client.HttpStack httpStack) + 0xe0 bytes 
                                      Microsoft.Data.Services.Client.LightSwitch!System.Data.Services.Client.HttpWebRequestMessage.CreateRequest(Microsoft.Data.OData.HttpMethod method, System.Uri requestUrl, System.Data.Services.Client.RequestInfo requestInfo, System.Data.Services.Client.HttpStack httpStack) + 0x6a bytes 
                                      Microsoft.Data.Services.Client.LightSwitch!System.Data.Services.Client.HttpWebRequestMessage.HttpWebRequestMessage(System.Uri requestUri, Microsoft.Data.OData.HttpMethod httpMethod, System.Data.Services.Client.RequestInfo requestInfo, System.Data.Services.Client.HttpStack httpStack) + 0x73 bytes 
                                      Microsoft.Data.Services.Client.LightSwitch!System.Data.Services.Client.ODataRequestMessageWrapper.ODataRequestMessageWrapper(Microsoft.Data.OData.HttpMethod httpMethod, System.Uri requestUrl, System.Data.Services.Client.RequestInfo requestInfo, System.Data.Services.Client.HttpStack httpStack) + 0x55 bytes 
                                      Microsoft.Data.Services.Client.LightSwitch!System.Data.Services.Client.DataServiceContext.CreateODataRequestMessage(Microsoft.Data.OData.HttpMethod httpMethod, System.Uri requestUri, bool allowAnyType, System.Version requestVersion, System.Data.Services.Client.HttpStack httpStackArg, System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<string,string>> headers, System.Collections.Generic.IEnumerable<string> headersToReset) + 0x78 bytes 
                                      Microsoft.Data.Services.Client.LightSwitch!System.Data.Services.Client.DataServiceRequest.CreateResult(object source, System.Data.Services.Client.DataServiceContext context, System.AsyncCallback callback, object state, string method) + 0x2eb bytes 
                                      Microsoft.Data.Services.Client.LightSwitch!System.Data.Services.Client.DataServiceRequest.BeginExecute(object source, System.Data.Services.Client.DataServiceContext context, System.AsyncCallback callback, object state, string method) + 0x44 bytes 
                                      Microsoft.Data.Services.Client.LightSwitch!System.Data.Services.Client.DataServiceContext.InnerBeginExecute<int>(System.Uri requestUri, System.AsyncCallback callback, object state, Microsoft.Data.OData.HttpMethod httpMethod, string method, bool? singleResult, System.Data.Services.Client.OperationParameter[] operationParameters) + 0xfa bytes 
                                      Microsoft.Data.Services.Client.LightSwitch!System.Data.Services.Client.DataServiceContext.BeginExecute<int>(System.Uri requestUri, System.AsyncCallback callback, object state) + 0xa9 bytes 
                                      Microsoft.LightSwitch.Base.Client!Microsoft.LightSwitch.ClientGenerated.Implementation.OperationImplementation<int>.ExecuteGetOperation(Microsoft.LightSwitch.Framework.Base.ExecutableObject<int>.ExecutionWithResult execution, System.Uri operationUri) + 0xd9 bytes 
                                      Microsoft.LightSwitch.Base.Client!Microsoft.LightSwitch.ClientGenerated.Implementation.OperationImplementation<int>.DoExecution(Microsoft.LightSwitch.Framework.Base.ExecutableObject<int>.ExecutionWithResult execution) + 0x273 bytes 
                                      Microsoft.LightSwitch!Microsoft.LightSwitch.Framework.Base.ExecutableObject<int>.DoExecution(Microsoft.LightSwitch.Framework.Base.ExecutableObject.Execution execution) + 0x67 bytes 
                                      Microsoft.LightSwitch!Microsoft.LightSwitch.Framework.Base.ExecutableObject.ExecuteAsync(bool allowJoin) + 0x36a bytes 
                                      Microsoft.LightSwitch!Microsoft.LightSwitch.Framework.Base.ExecutableObject.ExecuteAsync() + 0x28 bytes 
                                      Microsoft.LightSwitch.Base.Client!Microsoft.LightSwitch.ClientGenerated.Implementation.DataServiceContext.Microsoft.LightSwitch.Internal.IDataServiceImplementationCore.BeginLoadEntitySetCanInformation(string entitySetName) + 0xce bytes 
                                      Microsoft.LightSwitch!Microsoft.LightSwitch.Details.Framework.Internal.CanInformation.BeginLoad(Microsoft.LightSwitch.IDataService dataService, Microsoft.LightSwitch.Model.IEntitySetDefinition entitySetDef) + 0xfe bytes 
                                      Microsoft.LightSwitch.Client!Microsoft.LightSwitch.Details.Framework.Client.ScreenDetails<LightSwitchApplication.RepasseDeParceiros,LightSwitchApplication.RepasseDeParceiros.DetailsClass>.Initialize(Microsoft.LightSwitch.Client.IClientApplication application, string modelId) + 0xa2b bytes 
                                      Microsoft.LightSwitch.Client!Microsoft.LightSwitch.Framework.Client.ScreenObject<LightSwitchApplication.RepasseDeParceiros,LightSwitchApplication.RepasseDeParceiros.DetailsClass>.ScreenObject(string modelId) + 0xd2 bytes 
                                    > Cdv.Client!LightSwitchApplication.RepasseDeParceiros.New() Line 32746 + 0x12 bytes Basic
                                      Cdv.Client!LightSwitchApplication.RepasseDeParceiros.CreateInstance() Line 32754 + 0x19 bytes Basic
                                      Cdv.Client!LightSwitchApplication.Application.DetailsClass.CreateScreen(String screenName, Object() args) Line 986 + 0x5 bytes Basic
                                      Microsoft.LightSwitch.Client!Microsoft.LightSwitch.Details.Framework.Client.ClientApplicationDetails<LightSwitchApplication.Application,LightSwitchApplication.Application.DetailsClass>.RefreshScreen.AnonymousMethod__6a() + 0x67b bytes 
                                      Microsoft.LightSwitch!Microsoft.LightSwitch.Threading.DispatcherExtensions.Invoke(Microsoft.LightSwitch.Threading.IDispatcher dispatcher, System.Action action) + 0x13c bytes 
                                      Microsoft.LightSwitch.Client!Microsoft.LightSwitch.Details.Framework.Client.ClientApplicationDetails<LightSwitchApplication.Application,LightSwitchApplication.Application.DetailsClass>.RefreshScreen(Microsoft.LightSwitch.Client.IScreenObject screen) + 0xf8 bytes 
                                      Microsoft.LightSwitch.Client!Microsoft.LightSwitch.Details.Framework.Client.ClientApplicationDetails<LightSwitchApplication.Application,LightSwitchApplication.Application.DetailsClass>.Microsoft.LightSwitch.Details.Client.IClientApplicationDetails.RefreshScreen(Microsoft.LightSwitch.Client.IScreenObject screen) + 0x32 bytes 
                                      Microsoft.LightSwitch.RuntimeEditor.Internal!Microsoft.LightSwitch.RuntimeEdit.Implementation.ScreenDesignerHostService.Reset.AnonymousMethod__2() + 0x203 bytes 
                                      [Native to Managed Transition] 
                                      [Managed to Native Transition] 
                                      mscorlib.dll!System.Delegate.DynamicInvokeImpl(object[] args) + 0x6b bytes 
                                      System.Windows.dll!System.Windows.Threading.DispatcherOperation.Invoke() + 0x26 bytes 
                                      System.Windows.dll!System.Windows.Threading.Dispatcher.Dispatch(System.Windows.Threading.DispatcherPriority priority) + 0xd5 bytes 
                                      System.Windows.dll!System.Windows.Threading.Dispatcher.OnInvoke(object context) + 0xa bytes 
                                      System.Windows.dll!System.Windows.Hosting.CallbackCookie.Invoke(object[] args) + 0x16 bytes 
                                      System.Windows.RuntimeHost.dll!System.Windows.RuntimeHost.ManagedHost.InvokeDelegate(System.IntPtr pHandle, int nParamCount, System.Windows.Hosting.NativeMethods.ScriptParam[] pParams, ref System.Windows.Hosting.NativeMethods.ScriptParam pResult) + 0xe9 bytes 
                                      [Appdomain Transition] 


                                    > System.ServiceModel.dll!System.ServiceModel.AsyncResult.End<System.ServiceModel.Channels.DuplexChannel.HelpReceiveAsyncResult>(System.IAsyncResult result) + 0x166 bytes 
                                      System.ServiceModel.PollingDuplex!System.ServiceModel.Channels.DuplexChannel.HelpReceiveAsyncResult.End(System.IAsyncResult result) + 0x32 bytes 
                                      System.ServiceModel.PollingDuplex!System.ServiceModel.Channels.DuplexChannel.HelpEndReceive(System.IAsyncResult result) + 0x29 bytes 
                                      System.ServiceModel.PollingDuplex!System.ServiceModel.Channels.DuplexChannel.EndReceive(System.IAsyncResult result) + 0x28 bytes 
                                      Microsoft.LightSwitch.Client.Internal!Microsoft.LightSwitch.AppBridge.Implementation.Client.WebClientChannel.CompleteReceive(System.IAsyncResult result) + 0x7d bytes 
                                      Microsoft.LightSwitch.Client.Internal!Microsoft.LightSwitch.AppBridge.Implementation.Client.WebClientChannel.OnReceiveComplete(System.IAsyncResult result) + 0x45 bytes 
                                      System.ServiceModel.dll!System.ServiceModel.AsyncResult.Complete(bool completedSynchronously) + 0xbe bytes 
                                      System.ServiceModel.dll!System.ServiceModel.AsyncResult.Complete(bool completedSynchronously, System.Exception exception) + 0x1c bytes 
                                      System.ServiceModel.PollingDuplex!System.ServiceModel.Channels.DuplexChannel.HelpReceiveAsyncResult.OnReceive(System.IAsyncResult result) + 0xfe bytes 
                                      System.ServiceModel.dll!System.ServiceModel.AsyncResult.Complete(bool completedSynchronously) + 0xbe bytes 
                                      System.ServiceModel.dll!System.ServiceModel.AsyncResult.Complete(bool completedSynchronously, System.Exception exception) + 0x1c bytes 
                                      System.ServiceModel.PollingDuplex!System.ServiceModel.Channels.InputQueue<System.ServiceModel.Channels.Message>.AsyncQueueReader.Set(System.ServiceModel.Channels.InputQueue<System.ServiceModel.Channels.Message>.Item item) + 0x124 bytes 
                                      System.ServiceModel.PollingDuplex!System.ServiceModel.Channels.InputQueue<System.ServiceModel.Channels.Message>.Shutdown(System.ServiceModel.Channels.CommunicationObject communicationObject) + 0x2f6 bytes 
                                      System.ServiceModel.PollingDuplex!System.ServiceModel.Channels.InputQueueChannel<System.ServiceModel.Channels.Message>.OnFaulted() + 0x32 bytes 
                                      System.ServiceModel.dll!System.ServiceModel.Channels.CommunicationObject.Fault() + 0xb0 bytes 
                                      System.ServiceModel.PollingDuplex!System.ServiceModel.Channels.PollingDuplexSessionChannel.Fault() + 0x1d bytes 
                                      System.ServiceModel.PollingDuplex!System.ServiceModel.Channels.PollingDuplexSession.OnSessionInactive(object state) + 0x209 bytes 
                                      mscorlib.dll!System.Threading.TimerQueueTimer.CallCallbackInContext(object state) + 0x2c bytes 
                                      mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx) + 0x97 bytes 
                                      mscorlib.dll!System.Threading.TimerQueueTimer.CallCallback() + 0xbf bytes 
                                      mscorlib.dll!System.Threading.TimerQueueTimer.Fire() + 0xc0 bytes 
                                      mscorlib.dll!System.Threading.TimerQueue.FireQueuedTimerCompletion(object state) + 0x25 bytes 
                                      mscorlib.dll!System.Threading.QueueUserWorkItemCallback.System.Threading.IThreadPoolWorkItem.ExecuteWorkItem() + 0x33 bytes 
                                      mscorlib.dll!System.Threading.ThreadPoolWorkQueue.Dispatch() + 0x1b3 bytes 
                                      mscorlib.dll!System.Threading._ThreadPoolWaitCallback.PerformWaitCallback() + 0x5 bytes 
                                      [Native to Managed Transition] 
                                      [Appdomain Transition] 
                                      [Native to Managed Transition] 


                                    > System.ServiceModel.dll!System.ServiceModel.Channels.CommunicationObject.ThrowIfDisposedOrNotOpen() + 0xd6 bytes 
                                      System.ServiceModel.PollingDuplex!System.ServiceModel.Channels.DuplexChannel.BeginSend(System.ServiceModel.Channels.Message message, System.TimeSpan timeout, System.AsyncCallback callback, object state) + 0x10a bytes 
                                      System.ServiceModel.PollingDuplex!System.ServiceModel.Channels.DuplexChannel.BeginSend(System.ServiceModel.Channels.Message message, System.AsyncCallback callback, object state) + 0x69 bytes 
                                      Microsoft.LightSwitch.Client.Internal!Microsoft.LightSwitch.AppBridge.Implementation.Client.WebClientChannel.SendInternal(Microsoft.LightSwitch.AppBridge.Internal.GenericMessage message) + 0xd7 bytes 
                                      Microsoft.LightSwitch.Client.Internal!Microsoft.LightSwitch.AppBridge.Implementation.Client.WebClientChannel.Send(Microsoft.LightSwitch.AppBridge.Internal.MessageBase message) + 0xb8 bytes 
                                      Microsoft.LightSwitch.Client.Internal!Microsoft.LightSwitch.AppBridge.Implementation.AppBridgeService.SendMessageInternal(Microsoft.LightSwitch.AppBridge.Internal.MessageBase message, bool sameThread) + 0x17b bytes 
                                      Microsoft.LightSwitch.Client.Internal!Microsoft.LightSwitch.AppBridge.Implementation.AppBridgeService.PostMessageEx(Microsoft.LightSwitch.AppBridge.Internal.MessageBase message, bool sameThread) + 0x53 bytes 
                                      Microsoft.LightSwitch.Client.Internal!Microsoft.LightSwitch.AppBridge.Implementation.AppBridgeService.SendMessageEx(Microsoft.LightSwitch.AppBridge.Internal.MessageBase message, int timeOut, bool sameThread) + 0xf9 bytes 
                                      Microsoft.LightSwitch.Client.Internal!Microsoft.LightSwitch.AppBridge.Implementation.AppBridgeService.SendMessage(Microsoft.LightSwitch.AppBridge.Internal.MessageBase message) + 0x56 bytes 
                                      Microsoft.LightSwitch.RuntimeEditor.Internal!Microsoft.LightSwitch.RuntimeEdit.Implementation.ScreenDesignerHostService.SendMessageWithRetry(Microsoft.LightSwitch.AppBridge.Internal.MessageBase message) + 0x64 bytes 
                                      Microsoft.LightSwitch.RuntimeEditor.Internal!Microsoft.LightSwitch.RuntimeEdit.Implementation.ScreenDesignerHostService.PostRemotePersistChanges(object arg) + 0x57e bytes 
                                      mscorlib.dll!System.Threading.ThreadHelper.ThreadStart_Context(object state) + 0x9c bytes 
                                      mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state, bool preserveSyncCtx) + 0x97 bytes 
                                      mscorlib.dll!System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext executionContext, System.Threading.ContextCallback callback, object state) + 0x2a bytes 
                                      mscorlib.dll!System.Threading.ThreadHelper.ThreadStart(object obj) + 0x4a bytes 
                                      [Native to Managed Transition] 
                                      [Appdomain Transition] 
                                      [Native to Managed Transition] 


                                      Microsoft.Data.Services.Client.LightSwitch!System.Data.Services.Http.ScriptXmlHttpRequest.CreateNativeRequest() + 0x154 bytes 
                                      Microsoft.Data.Services.Client.LightSwitch!System.Data.Services.Http.ScriptXmlHttpRequest.ScriptXmlHttpRequest() + 0x37 bytes 
                                      Microsoft.Data.Services.Client.LightSwitch!System.Data.Services.Http.XHRHttpWebRequest.IsAvailable() + 0x47 bytes 
                                      Microsoft.Data.Services.Client.LightSwitch!System.Data.Services.Http.WebRequest.UriRequiresClientHttpWebRequest(System.Uri uri) + 0x34 bytes 
                                      Microsoft.Data.Services.Client.LightSwitch!System.Data.Services.Http.WebRequest.Create(System.Uri requestUri, System.Data.Services.Client.HttpStack httpStack) + 0xe0 bytes 
                                      Microsoft.Data.Services.Client.LightSwitch!System.Data.Services.Client.HttpWebRequestMessage.CreateRequest(Microsoft.Data.OData.HttpMethod method, System.Uri requestUrl, System.Data.Services.Client.RequestInfo requestInfo, System.Data.Services.Client.HttpStack httpStack) + 0x6a bytes 
                                      Microsoft.Data.Services.Client.LightSwitch!System.Data.Services.Client.HttpWebRequestMessage.HttpWebRequestMessage(System.Uri requestUri, Microsoft.Data.OData.HttpMethod httpMethod, System.Data.Services.Client.RequestInfo requestInfo, System.Data.Services.Client.HttpStack httpStack) + 0x73 bytes 
                                      Microsoft.Data.Services.Client.LightSwitch!System.Data.Services.Client.ODataRequestMessageWrapper.ODataRequestMessageWrapper(Microsoft.Data.OData.HttpMethod httpMethod, System.Uri requestUrl, System.Data.Services.Client.RequestInfo requestInfo, System.Data.Services.Client.HttpStack httpStack) + 0x55 bytes 
                                      Microsoft.Data.Services.Client.LightSwitch!System.Data.Services.Client.DataServiceContext.CreateODataRequestMessage(Microsoft.Data.OData.HttpMethod httpMethod, System.Uri requestUri, bool allowAnyType, System.Version requestVersion, System.Data.Services.Client.HttpStack httpStackArg, System.Collections.Generic.IEnumerable<System.Collections.Generic.KeyValuePair<string,string>> headers, System.Collections.Generic.IEnumerable<string> headersToReset) + 0x78 bytes 
                                      Microsoft.Data.Services.Client.LightSwitch!System.Data.Services.Client.DataServiceRequest.CreateResult(object source, System.Data.Services.Client.DataServiceContext context, System.AsyncCallback callback, object state, string method) + 0x2eb bytes 
                                      Microsoft.Data.Services.Client.LightSwitch!System.Data.Services.Client.DataServiceRequest.BeginExecute(object source, System.Data.Services.Client.DataServiceContext context, System.AsyncCallback callback, object state, string method) + 0x44 bytes 
                                      Microsoft.Data.Services.Client.LightSwitch!System.Data.Services.Client.DataServiceContext.InnerBeginExecute<int>(System.Uri requestUri, System.AsyncCallback callback, object state, Microsoft.Data.OData.HttpMethod httpMethod, string method, bool? singleResult, System.Data.Services.Client.OperationParameter[] operationParameters) + 0xfa bytes 
                                      Microsoft.Data.Services.Client.LightSwitch!System.Data.Services.Client.DataServiceContext.BeginExecute<int>(System.Uri requestUri, System.AsyncCallback callback, object state) + 0xa9 bytes 
                                      Microsoft.LightSwitch.Base.Client!Microsoft.LightSwitch.ClientGenerated.Implementation.OperationImplementation<int>.ExecuteGetOperation(Microsoft.LightSwitch.Framework.Base.ExecutableObject<int>.ExecutionWithResult execution, System.Uri operationUri) + 0xd9 bytes 
                                      Microsoft.LightSwitch.Base.Client!Microsoft.LightSwitch.ClientGenerated.Implementation.OperationImplementation<int>.DoExecution(Microsoft.LightSwitch.Framework.Base.ExecutableObject<int>.ExecutionWithResult execution) + 0x273 bytes 
                                      Microsoft.LightSwitch!Microsoft.LightSwitch.Framework.Base.ExecutableObject<int>.DoExecution(Microsoft.LightSwitch.Framework.Base.ExecutableObject.Execution execution) + 0x67 bytes 
                                      Microsoft.LightSwitch!Microsoft.LightSwitch.Framework.Base.ExecutableObject.ExecuteAsync(bool allowJoin) + 0x36a bytes 
                                      Microsoft.LightSwitch!Microsoft.LightSwitch.Framework.Base.ExecutableObject.ExecuteAsync() + 0x28 bytes 
                                      Microsoft.LightSwitch.Base.Client!Microsoft.LightSwitch.ClientGenerated.Implementation.DataServiceContext.Microsoft.LightSwitch.Internal.IDataServiceImplementationCore.BeginLoadEntitySetCanInformation(string entitySetName) + 0xce bytes 
                                      Microsoft.LightSwitch!Microsoft.LightSwitch.Details.Framework.Internal.CanInformation.BeginLoad(Microsoft.LightSwitch.IDataService dataService, Microsoft.LightSwitch.Model.IEntitySetDefinition entitySetDef) + 0xfe bytes 
                                      Microsoft.LightSwitch.Client!Microsoft.LightSwitch.Details.Framework.Client.ScreenDetails<LightSwitchApplication.RepasseDeParceiros,LightSwitchApplication.RepasseDeParceiros.DetailsClass>.Initialize(Microsoft.LightSwitch.Client.IClientApplication application, string modelId) + 0xa2b bytes 
                                      Microsoft.LightSwitch.Client!Microsoft.LightSwitch.Framework.Client.ScreenObject<LightSwitchApplication.RepasseDeParceiros,LightSwitchApplication.RepasseDeParceiros.DetailsClass>.ScreenObject(string modelId) + 0xd2 bytes 
                                    > Cdv.Client!LightSwitchApplication.RepasseDeParceiros.New() Line 32746 + 0x12 bytes Basic
                                      Cdv.Client!LightSwitchApplication.RepasseDeParceiros.CreateInstance() Line 32754 + 0x19 bytes Basic
                                      Cdv.Client!LightSwitchApplication.Application.DetailsClass.CreateScreen(String screenName, Object() args) Line 986 + 0x5 bytes Basic
                                      Microsoft.LightSwitch.Client!Microsoft.LightSwitch.Details.Framework.Client.ClientApplicationDetails<LightSwitchApplication.Application,LightSwitchApplication.Application.DetailsClass>.RefreshScreen.AnonymousMethod__6a() + 0x67b bytes 
                                      Microsoft.LightSwitch!Microsoft.LightSwitch.Threading.DispatcherExtensions.Invoke(Microsoft.LightSwitch.Threading.IDispatcher dispatcher, System.Action action) + 0x13c bytes 
                                      Microsoft.LightSwitch.Client!Microsoft.LightSwitch.Details.Framework.Client.ClientApplicationDetails<LightSwitchApplication.Application,LightSwitchApplication.Application.DetailsClass>.RefreshScreen(Microsoft.LightSwitch.Client.IScreenObject screen) + 0xf8 bytes 
                                      Microsoft.LightSwitch.Client!Microsoft.LightSwitch.Details.Framework.Client.ClientApplicationDetails<LightSwitchApplication.Application,LightSwitchApplication.Application.DetailsClass>.Microsoft.LightSwitch.Details.Client.IClientApplicationDetails.RefreshScreen(Microsoft.LightSwitch.Client.IScreenObject screen) + 0x32 bytes 
                                      Microsoft.LightSwitch.RuntimeEditor.Internal!Microsoft.LightSwitch.RuntimeEdit.Implementation.ScreenDesignerHostService.Reset.AnonymousMethod__2() + 0x203 bytes 
                                      [Native to Managed Transition] 
                                      [Managed to Native Transition] 
                                      mscorlib.dll!System.Delegate.DynamicInvokeImpl(object[] args) + 0x6b bytes 
                                      System.Windows.dll!System.Windows.Threading.DispatcherOperation.Invoke() + 0x26 bytes 
                                      System.Windows.dll!System.Windows.Threading.Dispatcher.Dispatch(System.Windows.Threading.DispatcherPriority priority) + 0xd5 bytes 
                                      System.Windows.dll!System.Windows.Threading.Dispatcher.OnInvoke(object context) + 0xa bytes 
                                      System.Windows.dll!System.Windows.Hosting.CallbackCookie.Invoke(object[] args) + 0x16 bytes 
                                      System.Windows.RuntimeHost.dll!System.Windows.RuntimeHost.ManagedHost.InvokeDelegate(System.IntPtr pHandle, int nParamCount, System.Windows.Hosting.NativeMethods.ScriptParam[] pParams, ref System.Windows.Hosting.NativeMethods.ScriptParam pResult) + 0xe9 bytes 
                                      [Appdomain Transition] 

                                     

                                     

                                       
                                    • Saturday, April 28, 2012 9:27 PM
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                                      I think those call stacks are for exceptions that are not NullReferenceExceptions. The ones above occur because communication from the application back to VS timed out. I just want the call stacks for the NullReferenceExceptions.

                                      Justin Anderson, LightSwitch Development Team

                                         
                                      • Sunday, April 29, 2012 2:44 AM
                                         
                                         
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                                        System.NullReferenceException occurred
                                          Message=Object reference not set to an instance of an object.
                                          StackTrace:
                                               em Microsoft.LightSwitch.Cosmopolitan.Model.ScreenModel.DelayedDispatcherBusyListener.ResetTimer()
                                          InnerException:

                                        > Microsoft.LightSwitch.Cosmopolitan.Client!Microsoft.LightSwitch.Cosmopolitan.Model.ScreenModel.DelayedDispatcherBusyListener.ResetTimer() + 0x39 bytes 
                                          Microsoft.LightSwitch.Cosmopolitan.Client!Microsoft.LightSwitch.Cosmopolitan.Model.ScreenModel.DelayedDispatcherBusyListener.Dispatcher_IsProcessingChanged.AnonymousMethod__6() + 0x1d bytes 
                                          [Native to Managed Transition] 
                                          [Managed to Native Transition] 
                                          mscorlib.dll!System.Delegate.DynamicInvokeImpl(object[] args) + 0x6b bytes 
                                          System.Windows.dll!System.Windows.Threading.DispatcherOperation.Invoke() + 0x26 bytes 
                                          System.Windows.dll!System.Windows.Threading.Dispatcher.Dispatch(System.Windows.Threading.DispatcherPriority priority) + 0xd5 bytes 
                                          System.Windows.dll!System.Windows.Threading.Dispatcher.OnInvoke(object context) + 0xa bytes 
                                          System.Windows.dll!System.Windows.Hosting.CallbackCookie.Invoke(object[] args) + 0x16 bytes 
                                          System.Windows.RuntimeHost.dll!System.Windows.RuntimeHost.ManagedHost.InvokeDelegate(System.IntPtr pHandle, int nParamCount, System.Windows.Hosting.NativeMethods.ScriptParam[] pParams, ref System.Windows.Hosting.NativeMethods.ScriptParam pResult) + 0xe9 bytes 
                                          [Appdomain Transition] 

                                           
                                        • Wednesday, May 09, 2012 9:38 AM
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                                           Answered
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                                          We identified this particular issue not too long ago, but found it after releasing the Beta of the Cosmopolitan shell. It should be fixed in the next release. Thanks for reporting it though.

                                          Please let us know if there are different call stacks for the other NullReferenceException instances.

                                          Justin Anderson, LightSwitch Development Team

                                             
                                          • Wednesday, May 09, 2012 12:05 PM
                                             
                                             
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                                            @Justin...

                                            Perhaps unrelated to this specific bug, but I have this issue as well.

                                            I have two accounts on my pc: work & personal.  On the one account, I can use LightSwitch and edit screens at runtime, on the other account I can use LightSwitch but editing the screens at runtime throws the same exception.

                                            Do you think this is a separate cause, and worth logging a bug for?

                                            It's your story - time to switch on the innovation. || About me || LightSwitch blog

                                               
                                            • Thursday, May 10, 2012 8:27 PM
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                                              Is it the same call stack that Marden LR is reporting? If it is, it's the same issue and not worth logging a bug for it.

                                              Justin Anderson, LightSwitch Development Team

                                                 
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