title: Error when drawing route between 2 BasicGeoposition in Windows Phone 8.1?
body: <p>I made an app about using map which can draw the route between 2 points in this map. However, sometime when I tried to draw a route, it returned an exception like that: "Exception thrown: 'System.ArgumentException' in map_test-main.exe
  WinRT information: route". So what is the cause of this problem? Many thanks!</p>
  
  <p>Heere is my code</p>
  
  <pre><code>try
          {
              BasicGeoposition startLocation = new BasicGeoposition();
              startLocation.Latitude = 47.643;
              startLocation.Longitude = -122.131;
              Geopoint startPoint = new Geopoint(startLocation);
  
              // End at the city of Seattle, Washington.
              BasicGeoposition endLocation = new BasicGeoposition();
              endLocation.Latitude = 47.604;
              endLocation.Longitude = -122.329;
              Geopoint endPoint = new Geopoint(endLocation);
  
              MapRouteFinderResult routeResult = await MapRouteFinder.GetDrivingRouteAsync
               (startPoint, endPoint, MapRouteOptimization.Time, MapRouteRestrictions.None);
              //MapRouteFinderResult routeResult = await MapRouteFinder.GetDrivingRouteAsync
              //   (new Geopoint(pointStart), new Geopoint(pointEnd), MapRouteOptimization.Time, MapRouteRestrictions.TollRoads);
  
              MapRouteView viewOfRoute = new MapRouteView(routeResult.Route);
  
              if (routeResult.Status == MapRouteFinderStatus.Success)
              {
                  myMap.Routes.Clear();
                  myMap.Routes.Add(viewOfRoute);
  
                  await myMap.TrySetViewBoundsAsync(
                      routeResult.Route.BoundingBox, null,
                      Windows.UI.Xaml.Controls.Maps.MapAnimationKind.Default);
              }
          }
          catch (Exception ex)
          {
          }
  </code></pre>
  
  <p>P/s: By the way, I am in Vietnam when I debugged these codes.</p>