My app has been using this line without a problem for a couple of weeks. It still runs OK now but the VisibleLayers setting is producing an error in the editor. It says "Unable to cast object of type Microsoft.Expression.DesignModel.DocumentModel.DocumentPrimativeNode to Microsoft.Expression.DesignModel.DocumentModel.DocumentCompositeNode." What does this mean and how do I fix it?<esri:ArcGISDynamicMapServiceLayer ID="SchoolSearch3"
Url="http://198.182.104.173/ArcGIS/rest/services/SchoolSearch3/MapServer"
VisibleLayers="0,1" />