MVC4 MVC3 side by side installation error

by Admin 15. July 2012 11:56

If you install MVC4 on an existing MVC3 s/w . The MVC3 applications will not compile and end up with the following error:

The type 'System.Web.Mvc.ModelClientValidationRule' exists in both 'c:\Program Files (x86)\Microsoft ASP.NET\ASP.NET MVC 3\Assemblies\System.Web.Mvc.dll' and 'c:\Program Files (x86)\Microsoft ASP.NET\ASP.NET Web Pages\v2.0\Assemblies\System.Web.WebPages.dll' 

It would appear this has been moved to a different assembly and since both assemblies are in the GAC it does not know which to use.


Edit the csproj:


Change the following 

<Reference Include="System.Web.WebPages"/> 


<Reference Include="System.Web.WebPages, Version=, Culture=neutral, PublicKeyToken=31bf3856ad364e35, processorArchitecture=MSIL "/>

Hope this helps!



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