Multiple types were found that match the controller named 'Home'. (weird error)

Question

I am having this error on my new asp.net app

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: Contoso.CAMPF.Sample1Web.Controllers.HomeController CAMPF.WebApp.Controllers.HomeController

The weird thing is that I dont event have a constoso namespace anywhere, I removed it, in the past I did, but I decided at some point to change assembly and namespaces names.

namespace CAMPF.WebApp.Controllers
{
    public class HomeController : Controller
    {
        [SharePointContextFilter]
        public ActionResult Index()
        {

Have you done a search in your solution/project for "Contoso"? What are the project properties for default namespace? — Tim
Yes I did, and Contoso is no where, the same for Sample1Web no where found on the project, its really weird — Luis Valencia
Hmm....that is odd. Did you try cleaning the solution and then building it again? — Tim
found the error, because I changed the namespace and assembly name, then on the bin folder the old dll was still there, so it looks like the mvc engine searches for controllers in the entire bin folder – — Luis Valencia
Nice find. You should post that as the answer (you can auto-accept it after a period of time). — Tim

Luis Valencia Luis Valencia · Accepted Answer · 2014-05-14T21:14:53

found the error, because I changed the namespace and assembly name, then on the bin folder the old dll was still there, so it looks like the mvc engine searches for controllers in the entire bin folder

Multiple types were found that match the controller named 'Home'. (weird error)

2 Answers