حرفه ای: 500 - Internal server error

protected void Application_Start()        {

            AreaRegistration.RegisterAllAreas();

            FilterConfig.RegisterGlobalFilters(GlobalFilters.F  ilters);

            GlobalConfiguration.Configure(RouteConfig.WebApiCo  nfig.Register);

            RouteConfig.RegisterRoutes(RouteTable.Routes);

            BundleConfig.RegisterBundles(BundleTable.Bundles);

        }

 public static class WebApiConfig        {

            public static void Register(HttpConfiguration config)

            {

                config.MapHttpAttributeRoutes();

                config.Routes.MapHttpRoute(

                    name: "DefaultApi",

                    routeTemplate: "api/{controller}/{action}/{id}",

                    defaults: new { id = RouteParameter.Optional }

                );

            }

        }

      GlobalConfiguration.Configure(RouteConfig.WebApiCo  nfig.Register);