Conflicting versions of ASP.NET Web Pages detected: specified version is “1.0.0.0”, but the version in bin is “2.0.0.0” in ASP.MET MVC 3

I had this issue after upgrading to VS 2013 Express Preview.

Then I noticed there was a line in web.config that was:

 <add key="webpages:Version" value="1.0.0.0" />

Changed it to the version of system.web.webpages.dll in my bin folder:

 <add key="webpages:Version" value="3.0.0.0" />

…and the problem went away. (in your case I guess it’s 2.0.0.0.)