BaseController is not inherting HomeController.

public class BaseController : Controller
    {
        protected override void ExecuteCore()
        {
            string cultureName = null;
            // Attempt to read the culture cookie from Request
            HttpCookie cultureCookie = Request.Cookies["_culture"];
            if (cultureCookie != null)
                cultureName = cultureCookie.Value;
            else
                cultureName = Request.UserLanguages[0]; // obtain it from HTTP header AcceptLanguages

            // Validate culture name
            cultureName = CultureHelper.GetImplementedCulture(cultureName); // This is safe

 
            // Modify current thread's cultures
            Thread.CurrentThread.CurrentCulture = new System.Globalization.CultureInfo(cultureName);
            Thread.CurrentThread.CurrentUICulture = Thread.CurrentThread.CurrentCulture;
 
            base.ExecuteCore();
        }
 
    }

public class HomeController : BaseController
   {
       public ActionResult Index() {
 
           return View();
       }
   }