Failed to Create AppDomain

What is this Error For? I repaire开发者_如何学Cd my Vs but this did not solve it.

My OS : Windows 7 64 bit home edition. Visual studio 2010 Ultimate. Does My question need more information?

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The answer that worked for me was change the 'web.config' file from

<trust legacyCasModel="true" />

to

<trust legacyCasModel="false" />

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If for some reason you were tweaking your CAS settings, this might have caused it:

http://mtaulty.com/CommunityServer/blogs/mike_taultys_blog/archive/2005/03/16/5345.aspx

Get a fresh copy of the security config file and see if that fixes it:

https://connect.microsoft.com/VisualStudio/feedback/details/364087/event-id-1088-error-code-0x80131501

or,

Visual Studio Command Prompt -> caspol -reset

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Quite late but still hope this will be useful for somebody:

I got into the same nightmare these days and none of the found solutions worked for me. I tried this link codeproject.com and the Capsol command was not found by the VS Command Line, and renaming the files didn't work either.

So, today I decided to simply delete (backup first!) the folder v2.0.50727 located into #:\Documents and Settings\{user}\Application Data\Microsoft\CLR Security Config and Voila! VS is debugging again.