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I get this error when running any new ASP.NET MVC 4 project:
Compiler Error Message: CS0433: The type
‘System.Web.Optimization.BundleTable’ exists in both
‘c:\Windows\Microsoft.NET\assembly\GAC_32\System.Web\v4.0_4.0.0.0__b03f5f7f11d50a3a\System.Web.dll’
and ‘c:\Windows\Microsoft.NET\Framework\v4.0.30319\Temporary ASP.NET
Files\root\05fd41d4\f4dfecc4\assembly\dl3\1577f2c6\e8fef103_d1f6cc01\System.Web.Optimization.DLL’
It looks like you have .NET Framework 4.5 Developer Preview installed (this is where
System.Web.Optimization.BundleTableinSystem.Web.dllis coming from) and ASP.NET MVC 4 Beta is not compatible with it (you can read release notes here: http://www.asp.net/whitepapers/mvc4-release-notes)