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

please see the below release notes :

http://www.asp.net/learn/whitepapers/mvc4-release-notes

Installing ASP.NET MVC 4 Developer Preview breaks ASP.NET MVC 3 RTM applications.

ASP.NET MVC 3 applications that were created with the RTM release (not with the ASP.NET MVC 3 Tools Update release) require the following changes in order to work side-by-side with ASP.NET MVC 4 Developer Preview. Building the project without making these updates results in compilation errors.

http://www.asp.net/learn/whitepapers/mvc4-release-notes#_Toc303253815