By default does not redirect to controller index action method

I recently created a controller call DashboardVideos

and action method called Index

.

And after Add

Or Update

, I redirect it to the index page with

RedirectToAction("Index", "DashboardVideos")

...

but this code redirects it to /DashboardVideos/

and it says

HTTP Error 403.14 - Forbidden The web server is configured to not display the contents of this directory.

so the issue defaults to the page loading Index

when I say /Dashboard

But its not, the same url pattern works with all other controller (so I don't think there is anything wrong with the routing pattern).

Any help would be appreciated.

code:

 public class DashboardVideosController : BaseController
    {
        private readonly IDashboardVideosComponent socialTagComponent;

        public DashboardVideosController()
        {
            socialTagComponent = ComponentFactory.Get<IDashboardVideosComponent>();
        }

        // GET: DashboardVideos
        public ActionResult Index()
        {
            return View();
        }

        [HttpPost]
    public ActionResult AddUpdate(DashboardVideosModel socialTagChannel)
    {
       //Save data to database
        return RedirectToAction("Index", "DashboardVideos");
    }
     }