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    <p>I'm new to Windows Phone 7 development here. I have recently downloaded and tried out the Arcgis sample Map and it gives me this error after changing the TiledMapserverlayer's URL. </p> <pre><code>Invalid spatial reference. Spatial reference must match map's spatial reference. Clear the map layers collection prior to changing the spatial reference. </code></pre> <p>.xaml </p> <pre><code> &lt;esri:GraphicsLayer ID="MyGraphicsLayer"&gt; &lt;esri:GraphicsLayer.Graphics&gt; &lt;esri:Graphic Symbol="{StaticResource RedMarkerSymbol}"&gt; &lt;esriGeometry:MapPoint X="11560518.5450925" Y="153495.271364825"&gt; &lt;/esriGeometry:MapPoint&gt; &lt;/esri:Graphic&gt; &lt;/esri:GraphicsLayer.Graphics&gt; &lt;/esri:GraphicsLayer&gt; &lt;esri:ArcGISTiledMapServiceLayer ID="MyLayer" Url="http://www.onemap.sg/ArcGIS/rest/services/basemap/MapServer" /&gt; &lt;/esri:Map&gt; </code></pre> <p>.cs</p> <pre><code> public partial class Map : PhoneApplicationPage { GeoCoordinateWatcher _watcher; Graphic _graphicLocation; private static ESRI.ArcGIS.Client.Projection.WebMercator mercator = new ESRI.ArcGIS.Client.Projection.WebMercator(); bool initialLoad = true; public Map() { InitializeComponent(); _graphicLocation = (MyMap.Layers["MyGraphicsLayer"] as GraphicsLayer).Graphics[0]; _watcher = new GeoCoordinateWatcher(GeoPositionAccuracy.High); _watcher.MovementThreshold = 20; _watcher.StatusChanged += watcher_StatusChanged; _watcher.PositionChanged += watcher_PositionChanged; // Start data acquisition _watcher.Start(); } void watcher_StatusChanged(object sender, GeoPositionStatusChangedEventArgs e) { switch (e.Status) { case GeoPositionStatus.Disabled: // The location service is disabled or unsupported. // Alert the user StatusTextBlock.Text = "Location is unsupported on this device"; break; case GeoPositionStatus.Initializing: // The location service is initializing. // Disable the Start Location button StatusTextBlock.Text = "Initializing location service"; break; case GeoPositionStatus.NoData: // The location service is working, but it cannot get location data // Alert the user and enable the Stop Location button StatusTextBlock.Text = "Data unavailable"; break; case GeoPositionStatus.Ready: // The location service is working and is receiving location data // Show the current position and enable the Stop Location button StatusTextBlock.Text = "Ready - retrieving data"; break; } } void watcher_PositionChanged(object sender, GeoPositionChangedEventArgs&lt;GeoCoordinate&gt; e) { _graphicLocation.Geometry = mercator.FromGeographic(new MapPoint(e.Position.Location.Longitude, e.Position.Location.Latitude)); // Use horizontal accuracy (returned in meters) to zoom to the location if (initialLoad) { Envelope rect = new Envelope( (_graphicLocation.Geometry as MapPoint).X - (e.Position.Location.HorizontalAccuracy / 2), (_graphicLocation.Geometry as MapPoint).Y - (e.Position.Location.HorizontalAccuracy / 2), (_graphicLocation.Geometry as MapPoint).X + (e.Position.Location.HorizontalAccuracy / 2), (_graphicLocation.Geometry as MapPoint).Y + (e.Position.Location.HorizontalAccuracy / 2)); MyMap.ZoomTo(rect.Expand(20)); initialLoad = false; } else { MyMap.PanTo(_graphicLocation.Geometry); } } private void PhoneApplicationPage_Unloaded(object sender, RoutedEventArgs e) { _watcher.Stop(); }} </code></pre> <p>I have tried many solution such as adding in the wkid but it doesn't work. I have been having this error for very long. Can someone please help! Thanks</p>
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    1. COgraphics that you add to a map must have the same spatial reference as the map. If you changed the URL, did you change to a map that has a different spatial reference? That may have caused the error. One possible solution is to reproject the coordinates of the graphics to the spatial reference of the map.
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