Value cannot be null. Parameter name: activationContext

Question

when I start application I have masage,

Value cannot be null.  Parameter name: activationContext

vs 2010 express

win 7

sorry bad english

tnx

Answer 1

Please post a snippet of code around location where error occurred.

 

Answer 2

Hi Ddr,

 

Welcome to MSDN forums.

 

“when I start application I have masage,

Value cannot be null.  Parameter name: activationContext”

è   

You can handle the UnhandledException event of the application and get all the information available about the exception like this:

 

Project menu -> Properties -> Application tab -> “View Application Events” button

Private Sub MyApplication_UnhandledException(ByVal sender As Object, ByVal e As Microsoft.VisualBasic.ApplicationServices.UnhandledExceptionEventArgs) Handles        Me.UnhandledException      MessageBox.Show(e.Exception.ToString)      e.ExitApplication = False End Sub

 

Additionally, Joe came across the similar issue “Value cannot be null. Parameter name: activationContext” in the following thread and fixed it. Please double check whether there is circular reference in your project.

http://social.msdn.microsoft.com/Forums/en-US/winformssetup/thread/b5ac9ae2-fffa-4d5a-b8f8-d8fdc00b7733

“My app is called SpotLight.  In Solution Explorer, if you double click My Project, and then click the References Tab, I had a Reference to SpotLight.  How it got there I'm not sure.  I did not put it there, but it apprently causes some kind of circular reference which caused Click Once to fail and my App to no longer run after a Publish.

To fix my problem I simply clicked on the SpotLight reference and deleted it.  Problem solved.”

 

 

Best regards,

Martin Xie

MSDN Subscriber Support in Forum

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Answer 3

tnx

problem is solved

Answer 4

Hello,

Today, I got exactly the same problem.
But when I try the first option it gives me the error: Event 'UnhandledException' cannot be found.

Can anybody help me?

Answer 5

Hello,

Today, I got exactly the same problem.
But when I try the first option it gives me the error: Event 'UnhandledException' cannot be found.

Can anybody help me?

Nobody?

Answer 6

Same here Niels1567, have a look at the references in Project/'projectname' Properties. You'll find a reference to your project there, like is mentioned in Martin Xiel's answer. I used the "Unused References..." button and then "Removed" the results. It fixed it.

Not sure about your problem, but my debugger didn't come up with any specific line of code that had an error. Looks like a Bug to me. VS2010 SP1 seems to be buggier than pre-SP1.

Answer 7

Same here Niels1567, have a look at the references in Project/'projectname' Properties. You'll find a reference to your project there, like is mentioned in Martin Xiel's answer. I used the "Unused References..." button and then "Removed" the results. It fixed it.

Not sure about your problem, but my debugger didn't come up with any specific line of code that had an error. Looks like a Bug to me. VS2010 SP1 seems to be buggier than pre-SP1.

THAT'S IT !!!! THX.   For google, may solve Problem with Tags :  Parametername: activationContext    {"Der Wert darf nicht NULL sein.\r\nParametername: activationContext"}   SMDiagnostics 4.0.0.0 Visual Basic .Net Express 2010 Quellen suchen Projekt nicht ausführbar

Answer 8

try unchecking the "enable clickonce security settings" checkbox in the security tab of the application properties(Projects Tab -> "Project Name" Properties-> Security Tab).

Answer 9

Just had the same issue, it was due to a circular reference in my project

Thanks Martin!

Answer 10

try unchecking the "enable clickonce security settings" checkbox in the security tab of the application properties(Projects Tab -> "Project Name" Properties-> Security Tab).

 Thanks a lot. This solved my problem

Answer 11

Thanks a lot. This solved my problem.