New MVC project cannot be compiled for following error: Global.asax.cs(44,44): Error CS0246: The type or namespace name `GlobalFilterCollection' could not be found. Are you missing an assembly reference? (CS0246) (Xablock) Usings: using System.Web.Routing; using System.Web.Mvc; using System.Web; Arch Linux - installation of MonoDevelop was after system upgrade. It shows version "5.7.1" - not "4.0.0". And a try .NET compiler + Mono - 4.5, 4, 4 CP.