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The most plausible explanation is that you probably erased something you shouldn't have erased or added something at a wrong place. For the first situation, there is nothing to do, I believe, so your mission is 'ruined' and you must redesign it again from scratch. For the second situation, I think that simply erasing that thing added at the wrong place will fix it.
Anyway, let people test your mission to see if it crashes for them too.
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