The controller for path was not found or does not implement IController

Question

I have an MVC4 project with language selection:

• en
• nl
• fr
• de

1 main part with:

• About
• Common (fo

Answer 1

In my case namespaces parameter was not matching the namespace of the controller.

public override void RegisterArea(AreaRegistrationContext context) 
{
    context.MapRoute(
        "Admin_default",
        "Admin/{controller}/{action}/{id}",
        new {controller = "Home", action = "Index", id = UrlParameter.Optional },
        namespaces: new[] { "Web.Areas.Admin.Controllers" }
    );
}