Hi.
I have Problem by UpdatePanel.
Please help me.
my error:
Cannot unregister UpdatePanel with ID '' since it was not registered with the ScriptManager. This might occur if the UpdatePanel was removed from the control tree and later added again, which is not supported.
Parameter name: updatePanel
[ArgumentException: Cannot unregister UpdatePanel with ID '' since it was not registered with the ScriptManager. This might occur if the UpdatePanel was removed from the control tree and later added again, which is not supported.
Parameter name: updatePanel]
System.Web.UI.PageRequestManager.UnregisterUpdatePanel(UpdatePanel updatePanel) +839559
System.Web.UI.UpdatePanel.OnUnload(EventArgs e) +2948636
System.Web.UI.Control.UnloadRecursive(Boolean dispose) +160
System.Web.UI.Control.UnloadRecursive(Boolean dispose) +323
System.Web.UI.Control.UnloadRecursive(Boolean dispose) +323
System.Web.UI.Control.UnloadRecursive(Boolean dispose) +323
System.Web.UI.Control.UnloadRecursive(Boolean dispose) +323
System.Web.UI.Page.UnloadRecursive(Boolean dispose) +24
System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +11297582
System.Web.UI.Page.ProcessRequest() +119
System.Web.UI.Page.ProcessRequest(HttpContext context) +167
ASP.controls_membership_request_default_aspx.ProcessRequest(HttpContext context) in c:\Windows\Microsoft.NET\Framework64\v4.0.30319\Temporary ASP.NET Files\localsamab\0ade0bce\7cf82176\App_Web_xbnt5ojs.0.cs:0
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +597
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +266
I add a Scrip Manager to Master Page.
Other parts are working properly but this part have Error.