asp.net mvc 5 - Mvc 5.1 MissingMethodException System.Web.WebPages.TypeHelper.ObjectToDictionaryUncached

Question

I'm update my MVC5 project to MVC5.1 and now have exception on route dictionary:

routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

stack trace:

{"Method not found: 'System.Web.Routing.RouteValueDictionary System.Web.WebPages.TypeHelper.ObjectToDictionaryUncached(System.Object)'."}

at System.Web.Mvc.RouteCollectionExtensions.CreateRouteValueDictionaryUncached(Object values)
at System.Web.Mvc.RouteCollectionExtensions.IgnoreRoute(RouteCollection routes, String url, Object constraints)
at System.Web.Mvc.RouteCollectionExtensions.IgnoreRoute(RouteCollection routes, String url)
at WebApplication1.RouteConfig.RegisterRoutes(RouteCollection routes) in c:UsersaivanovDocumentsVisual Studio 2013ProjectsWebApplication1WebApplication1App_StartRouteConfig.cs:line 14
at WebApplication1.MvcApplication.Application_Start() in c:UsersaivanovDocumentsVisual Studio 2013ProjectsWebApplication1WebApplication1Global.asax.cs:line 17

Answer 1

In the References i found that System.Web.WebPages.dll version 3.0.11001.0 shows this type of error, but when i replace it with System.Web.WebPages.dll version 3.0.20129.0 it works. So Simply you should delete the old one from refrences and download the other version and than clean solution, rebuild and it will work.