title: MVC 4 Can't fix the error The type 'System.Web.Mvc.WebViewPage <TModel> exists in the elements
body: <p>after moved my MVC 4 project from VS 2012 to VS 2013 Community I get the following error (in the LogIn.cshtml page).</p>
  
  <blockquote>
    <p>CS0433: The type 'System.Web.Mvc.WebViewPage  "exists in the elements c:\Windows\Microsoft.NET\assembly\GAC_MSIL\System.Web.Mvc\v4.0_4.0.0.0__31bf3856ad364e35\System.Web.Mvc.dll and c:\Windows\Microsoft.NET\assembly\GAC_MSIL\System.Web.Mvc\v4.0_3.0.0.0__31bf3856ad364e35\System.Web.Mvc.dll</p>
  </blockquote>
  
  <p>I deleted all files from <code>C:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files</code>, cleaned the solution but the problem remains. How to fix it ?</p>
  
  <h2>EDIT</h2>
  
  <p>The Test project used the MVC 3, that was the reason</p>