ModelClientValidationRule conflict

Question

I have installed vs 2011 developer preview side by side with vs 2010. Now when i run my asp.net mvc 3 project in vs 2010 I am getting the following error in my project where i a

Answer 1

The accepted answer was "useful" but after installing MVC4 beta today, a few of my MVC 3 projects would not compile. (ModelClientValidationRule conflict) The fix was:

Edit:

ProjectName.csproj

Change

To