http://developers.de/blogs/damir_dobric/archive/2013/12/27/error-when-using-older-asp-net-mvc-assemblies.aspxWhen migrating projects form older ASP.NET MVC version (i.e: MVC 4) you may experience some issues. Before you start migration I would highly recommend following article. It very nicely describes how to perform all required steps. Unfortunately the clockenCommunityServer 2008 SP1 (Build: 30619.63)