Error Rendering Control - ContentPlaceHolder1An unhandled exception has occuredThis control can only be used in a MasterPage.The above shows in the masterpage design pageIn the master page i have registered the below mentioned:<%@ Register Assembly="System.Web.Silverlight" Namespace="System.Web.UI.SilverlightControls" TagPrefix="asp" %><%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>I have a scriptmanager in the masterpage... What could be the problem... plzz help