The controller for path '/login.aspx' was not found or does not implement IController

Help
1

Hi everyone,
I am quite new to Auth0 implementation. I am tryig to redirect the login to Auth0 application I created (.net) and just after calling this method in the controller:

    public ActionResult Login(string returnUrl)
    {
        HttpContext.GetOwinContext().Authentication.Challenge(new AuthenticationProperties
            {
                RedirectUri = returnUrl ?? Url.Action("Index", "Home")
            },
            "Auth0");
        return new HttpUnauthorizedResult();
    }

For some reason the application is going on error:

The controller for path ‘/login.aspx’ was not found or does not implement IController.

Any idea? I copied the example for .NET OWIN application and using the same keys for domain etc. in the example I am correctly directed to the Auth0 Universal Login page.

Thanks,
Ross.