Undo 작업을 진행하는 동안 해당 Set 작업에 적용되어 있는 것과는 다른 컨텍스트가 발생했습니다. 해당 스레드에서는 컨텍스트가 Set이었는데 되돌려지지 않은 것 같습니다.
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English version
The Undo operation encountered a context that is different from what was applied in the corresponding Set operation. The possible cause is that a context was Set on the thread and not reverted(undone).