Problems with migrating an ASP.NET MVC 3 project to ASP.NET MVC 4

Hi,

I followed this link to migrate to ASP.NET MVC 4:

http://www.asp.net/whitepapers/mvc4-release-notes#_Toc303253806

But when then i try to build my mvc project, i have this error:

Error 237 } attendue c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET Files\temp\dc7ec4d3\106835c1\App_Web_1pvhxcoc.15.cs 6000
How can i solve it?