title: The version of clr.dll in the target does not match the one mscordacwks.dll was built for
body: <p>I am working in an ASP.NET MVC 3 application using the .NET framework 4.0. When I go to debug my application, i get the message:</p>
  
  <p>"Unable to attach to application 'webdev.webserver....
   The version of clr.dll in the target does not match the one mcordacwks.dll was built for.</p>
  
  <p>Do you want to continue anyways?"</p>
  
  <p>I have Windows 7, fully updated. I have repaired and uninstall/reinstall visual studio 2010 and repaired the .NET Framework 4. I am using VS 2010 ultimate. The application is ASP.NET, MVC, .NET 4, Linq to SQL, and ADO.NET entities, and TFS.</p>
  
  <p>I have not changed anything in the project nor changed anything on my system. The only thing I have done is update my computer. I have tried creating a blank project and get the same message. I cannot debug unit tests either without crashing. I have no clue what is going on!</p>