i see there are several reasons of this problem. i got it few times and it was quite annoyin cuz i couldnt solve it using that way. what ive done to recover my map? i just brang entitylist window too, but firstly ive selected whole worldspawn and exported it, and then exported one by one other entities (but those entities had
- ...) until i got error again. but sometimes u can just export everything that is in the entitylist to another file and the problem would disappear (phantom brush/entity ?).
but i think that when u come the first way u can export worldspawn with lights (not so big chance that lights are broken entities in your map).
beware of entiting already entitied brush...