Taken from old_bill:
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Taken from Marco Grubert:

E097 can have a number of reasons, usually it's faces that are very small or highly curved surfaces. The bad news is that there is no way to determine exactly which blocks caused the problem. The good news is that in the next map compiler release this error message has been removed, so build will continue.

old_bill
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Giorgi3

10,000 parts flying in a close formation does not constitute an airplane. Some assembly is required.