I've gotten the error before for no discernable reason. It probably has something to do with the dupe being corrupted during saving and there's nothing you can really do to recover the information. It's one of the reasons why I always suggest people make saves every 15-30 minutes of building anything complicated-- you can go back and delete old saves once you've created your final version, and it prevents a lot of other issues (loss due to crash/user error/nosy fucking twats.)
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