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Multiple types were found that match the controller named ‘Home’. This can happen if the route that services this request (‘{controller}/{action}/{id}’) does not specify namespaces to search for a controller that matches the request. If this is the case, register this route by calling an overload of the ‘MapRoute’ method that takes a ‘namespaces’ parameter.


The request for ‘Home’ has found the following matching controllers:
SomeNamespace.Web.Controllers.HomeController
SomeNamespace.Web.Areas.Admin.Controllers.HomeController

So, despite the fact that the controllers are in different namespaces, the app doesn’t know which one to use. Fortunately, there is an easy fix to tell MVC which namespace to use as the default. Open the global.asax.cs file from the root, and find the Application_Start method. It should have two lines in at the moment (AreaRegistration.RegisterAllAreas(); and RegisterRoutes(RouteTable.Routes);). Simply add the following line after these, replacing the namespace in quotes with the namespace of your controllers:

ControllerBuilder.Current.DefaultNamespaces.Add("DefaultNamespace.Controllers");