Resource not found in Area - asp.net-mvc

Question

I created an Area in MVC then I created a simple controller and I can't view the Area or any page within that part of my site does anyone know why and how to fix this problem. I created a project a while back with an Area and had no problems, I don't know what has changed or if I had to change something to make it work can somebody please help me out.
Somewhere it's not getting registered.
namespace RedPlanet.Areas.admin.Controllers
{
public class CategoryController : Controller
{
}
}
Area:
public class adminAreaRegistration : AreaRegistration
{
public override string AreaName
{
get
{
return "admin";
}
}
public override void RegisterArea(AreaRegistrationContext context)
{
context.MapRoute(
"admin_default",
"admin/{controller}/{action}/{id}",
new { action = "Index", id = UrlParameter.Optional }
);
}
}
Global ASAX:
public class MvcApplication : System.Web.HttpApplication
{
protected void Application_Start()
{
AreaRegistration.RegisterAllAreas();
WebApiConfig.Register(GlobalConfiguration.Configuration);
FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
RouteConfig.RegisterRoutes(RouteTable.Routes);
BundleConfig.RegisterBundles(BundleTable.Bundles);
AuthConfig.RegisterAuth();
System.Data.Entity.Database.SetInitializer(new System.Data.Entity.DropCreateDatabaseIfModelChanges<DataContext>());
}
}

Answer 1

You need to specify the namespace when registering the route for your admin area and Main Route in you Application.
Main Route :
routes.MapRoute(
"Default",
"{controller}/{action}/{id}",
new { controller = "Home", action = "Index", id = UrlParameter.Optional },
new string[] { "RedPlanet.Controllers" }// specify the namespace
);
In your \Areas\admin\adminAreaRegistration.cs file, you need to modify the RegisterArea() method as follows:
public override void RegisterArea(AreaRegistrationContext context)
{
context.MapRoute(
"admin_default",
"admin/{controller}/{action}/{id}",
new { action = "Index", id = UrlParameter.Optional },
new[] { "RedPlanet.Areas.admin.Controllers" }// specify the namespace
);
}
Update :
if you are using Guid you should change parameter type of your action method to Guid :
public ActionResult Details(Guid guid)
{
//code
return View(model);
}
then create new route for that ;
routes.MapRoute("FooRouteName",
"Controller/Action/{guidParam}",
new { controller = "Category", action = "Index" },
new { guidParam = #"^(\{){0,1}[0-9a-fA-F]{8}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{4}\-[0-9a-fA-F]{12}(\}){0,1}$" }
);