Slenderman Monster

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Yeah, I have no idea what the info in that log means. Except for the obvious of course - the joint you placed is not in the file. That's probably the problem. But whether this is because of wrong export settings, a bugged exporter or whatever, I don't know.

Only thing you can try is ask someone with a working exporter to create the .ent file for you.

Only way to find the problem now, would be to systematically try out all sorts of old maya versions and several older versions of the exporter with various testfiles and different export settings on various PCs with various graphics cards etc. until you find out where the problem lies...