I have a solution which contains 2 MVC projects.
When I open the solution I get the following error:

Never had this error before.
I'm developing in Visual Studio 2010.

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Posted Jun 12, 2012, 12:37 AM
Make sure, ASP.net version 4 is registered in IIS.
Olivier MuhringPosted Jun 12, 2012, 4:57 AM
Since IIS wasn't installed on my machine, I needed to install it and then run the "aspnet_regiis -i" command. like this:
After this the error dissappeared.