level sequencer problem

hello.
i have a sub level that it name is “Cutscene” and when game start, i play a level sequencer in cutscene sub level and after sequencer playing finished i unload “Cutscene” sublevel but i get error in MovieSceneSequenceInstance.cpp

deubg :

	ensureMsgf(!Pair.Value.Get(), TEXT("Sequence instance is being destroyed but still has spawned objects"));

what’s wrong?
please help.

Do you find the solution to this problem?