ID가 '<var>X</var>'인 UpdatePanel은 ScriptManager에 등록되어 있지 않으므로 등록을 취소할 수 없습니다. 이는 UpdatePanel이 컨트롤 트리에서 제거되었다가 나중에 다시 추가되는 경우 발생할 수 있는데 이러한 작업은 지원되지 않습니다.

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Cannot unregister UpdatePanel with ID '<var>X</var>' 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.

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