http://developers.de/blogs/damir_dobric/archive/2012/07/24/internal-server-error-asp-net-mvc-and-webapi-migration.aspxFew years age we implemented an ASP.NET  MVC 2.0 application. Now we waned extend the application for new REST services which can be consumed by mobile applications. For this reason we use NuGet update MVC on version 4 and to install the newest WebApienCommunityServer 2008 SP1 (Build: 30619.63)