ArcGISWindowsPhoneSDK.Routing.MyRouteTask_Failed C# (CSharp) Метод

        private void MyRouteTask_Failed(object sender, TaskFailedEventArgs e)
        {
            string errorMessage = "Routing error: ";
            errorMessage += e.Error.Message;
            foreach (string detail in (e.Error as ServiceException).Details)
                errorMessage += "," + detail;

            MessageBox.Show(errorMessage);
            GraphicsLayer stopsGraphicsLayer = MyMap.Layers["MyStopsGraphicsLayer"] as GraphicsLayer;
            stopsGraphicsLayer.Graphics.RemoveAt(stopsGraphicsLayer.Graphics.Count - 1);
        }