Application Error

Page_Error
Object reference not set to an instance of an object. Application Error at ESRI.ArcGIS.ADF.Web.UI.WebControls.MapTips.GetLayerID() at ESRI.ArcGIS.ADF.Web.UI.WebControls.MapTips.get_LayerID() at ESRI.ArcGIS.ADF.Web.UI.WebControls.MapTips.getDefaultLayerDefinition() at ESRI.ArcGIS.ADF.Web.UI.WebControls.MapTips.setupLayerMapTips() at ESRI.ArcGIS.ADF.Web.UI.WebControls.MapTips.OnLoad(EventArgs e) at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Control.LoadRecursive() at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)