I\'ve created a new MVC Web application and I have references to Ninject.dll, Ninject.Web.Common.dll and Ninject.Web.MVC.dll.
Global.asax.cs:
Be sure you are not referencing a project which also uses the NinjectMVC3 App_Start. After removing the reference to such, my project started working. Also, as said before, check the namespaces all match and are correct.
NinjectMVC3 App_Start