Saturday, June 09, 2012

VS 2010 Web Debug Fails To Start Due to "Invalid file name for file monitoring"


You try to launch your ASP.NET web application from Microsoft Visual Studio (2010) and you get the following error (you swear it was working an hour ago.) Note that the file name mentioned does not really matter. The symptom is that you cannot launch a web page in debug mode.

Invalid file name for file monitoring: 'C:\Blah\Whatever\App_LocalResources'. Common reasons for failure include:


The root cause is completely understood, but it has something to do with catching all un-handled CLR exceptions in the debug menu.

My Fix (May Not Work With You):

  • Go to Debug->Exceptions and un-check all un-handled exception checking.
  • Try to launch the debug session again. This time, it worked for me.
  • Go to Debug menu and then clear all break-points. This time, I can re-enable un-handled CLI exceptions and back to be able to launch and debug the app.
  • If above does not work, clear the .NET temp files for the framework version you are using. For example,

    C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files

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