Original:http://www.cnblogs.com/shouzheng/p/4035405.html
Microsoft Last security update ms14-059 (link: https://technet.microsoft.com/en-us/library/security/ ms14-059) due to the direct application to Machine.config, a reference to the ASP. NET MVC assembly version was updated, resulting in project compilation errors for ASP. NET MVC3 and 4 referencing the GAC, with the error:
"Could not locate the assembly" system.web.mvc,version=4.0.0.0, Culture=neutral, Publickeytoken=31bf3856ad364e35, Processorarchitecture=msil "
Thanks to the original author found the problem, I updated the MICROSOFT.ASPNET.MVC version to the latest resolved the problem, re-rebuild can be.
RELATED Links: http://blogs.msdn.com/b/webdev/archive/2014/10/16/microsoft-asp-net-mvc-security-update-broke-my-build.aspx
ASP. NET MVC Security update ms14-059 causes project compilation to fail