Server Error in Application - ".dll is not a valid file"

Question

I'm recieving the following error in a previously working Web Service, I can take the same code and run it on another server so I don't think it's a problem with the code, possibly an issue with .NET itself?

Heres the Error:

'oj4pmrco.dll' is not a valid file.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.IO.FileLoadException: 'oj4pmrco.dll' is not a valid file.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Assembly Load Trace: The following information can be helpful to determine why the assembly 'oj4pmrco.dll' could not be loaded.

=== Pre-bind state information === LOG: Where-ref bind. Location = c:\windows\microsoft.net\framework\v1.1.4322\Temporary ASP.NET Files\wssots\500341cd\30097746\oj4pmrco.dll LOG: Appbase = file:///c:/xxxxx/xxxxxx LOG: Initial PrivatePath = bin Calling assembly : (Unknown). === LOG: Policy not being applied to reference at this time (private, custom, partial, or location-based assembly bind). LOG: Attempting download of new URL file:///c:/windows/microsoft.net/framework/v1.1.4322/Temporary ASP.NET Files/wssots/500341cd/30097746/oj4pmrco.dll.

Stack Trace:

[FileLoadException: 'oj4pmrco.dll' is not a valid file.] System.Reflection.Assembly.nLoad(AssemblyName fileName, String codeBase, Boolean isStringized, Evidence assemblySecurity, Boolean throwOnFileNotFound, Assembly locationHint, StackCrawlMark& stackMark) +0 System.Reflection.Assembly.InternalLoad(AssemblyName assemblyRef, Boolean stringized, Evidence assemblySecurity, StackCrawlMark& stackMark) +307 System.Reflection.Assembly.Load(AssemblyName assemblyRef, Evidence assemblySecurity) +21 System.CodeDom.Compiler.CompilerResults.get_CompiledAssembly() +67 System.CodeDom.Compiler.CompilerResults.get_CompiledAssembly() +0 System.Web.Compilation.BaseCompiler.GetCompiledType() +376 System.Web.UI.PageParser.CompileIntoType() +60 System.Web.UI.TemplateParser.GetParserCacheItemThroughCompilation() +124 [HttpException (0x80004005): 'oj4pmrco.dll' is not a valid file.] System.Web.UI.TemplateParser.GetParserCacheItemInternal(Boolean fCreateIfNotFound) +947 System.Web.UI.TemplateParser.GetParserCacheItemWithNewConfigPath() +125 System.Web.UI.TemplateParser.GetParserCacheItem() +88 System.Web.UI.TemplateControlParser.CompileAndGetParserCacheItem(String virtualPath, String inputFile, HttpContext context) +115 System.Web.UI.TemplateControlParser.GetCompiledInstance(String virtualPath, String inputFile, HttpContext context) +36 System.Web.UI.PageParser.GetCompiledPageInstanceInternal(String virtualPath, String inputFile, HttpContext context) +43 System.Web.UI.PageParser.GetCompiledPageInstance(String virtualPath, String inputFile, HttpContext context) +250 System.Web.Services.Protocols.DocumentationServerProtocol.Initialize() +381 System.Web.Services.Protocols.ServerProtocolFactory.Create(Type type, HttpContext context, HttpRequest request, HttpResponse response, Boolean& abortProcessing) +106 [InvalidOperationException: Unable to handle request.] System.Web.Services.Protocols.ServerProtocolFactory.Create(Type type, HttpContext context, HttpRequest request, HttpResponse response, Boolean& abortProcessing) +205 System.Web.Services.Protocols.WebServiceHandlerFactory.CoreGetHandler(Type type, HttpContext context, HttpRequest request, HttpResponse response) +82 [InvalidOperationException: Failed to handle request.] System.Web.Services.Protocols.WebServiceHandlerFactory.CoreGetHandler(Type type, HttpContext context, HttpRequest request, HttpResponse response) +154 System.Web.Services.Protocols.WebServiceHandlerFactory.GetHandler(HttpContext context, String verb, String url, String filePath) +94 System.Web.HttpApplication.MapHttpHandler(HttpContext context, String requestType, String path, String pathTranslated, Boolean useAppConfig) +699 System.Web.MapHandlerExecutionStep.System.Web.HttpApplication+IExecutionStep.Execute() +95 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +173

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Version Information: Microsoft .NET Framework Version:1.1.4322.2443; ASP.NET Version:1.1.4322.2407

Answer 1

I think some of the files in that c:\windows\microsoft.net\framework\v1.1.4322\Temporary ASP.NET Files folder could be corrupted. Remove all the files in that temporary folder, and then restart IIS. Hopefully that will solve your problem in that particular machine.

Hope this helps.