ASP.Net MVC 4 - Multiple types were found that match the controller named 'Home'.

Question

Just created a new MVC 4 project and copied over some areas from an MVC 3 project. I have double checked all my web.configs and arearegistration.cs. My configs all point to the correct versions of razor and MVC and my routes.MapRoute signature includes the correct namespace parameters, I also checked and made sure my IIS pool was not hosting more than one MVC app.

my Global.asax file...

routes.MapRoute(
            "Default", // Route name
            "{controller}/{action}/{id}", // URL with parameters
            new { controller = "Home", action = "Index", id = UrlParameter.Optional }, // Parameter defaults
            new string[] { "MVCProject.Web.Controllers" }
        );

my area registration files...

context.MapRoute(
            "Admin_default",
            "Admin/{controller}/{action}/{id}",
            new { controller = "Home", action = "Index", id = UrlParameter.Optional },
            new string[] { "MVCProject.Web.Areas.Admin.Controllers" }
        );

and ...

context.MapRoute(
            "Terminator_default",
            "Terminator/{controller}/{action}/{id}",
            new { controller = "Home", action = "Index", id = UrlParameter.Optional },
            new string[] { "MVCProject.Web.Areas.Terminator.Controllers" }
        );

I have checked everything I know to check to fix this , the correct dll's area loaded as well...