I'm having an error I can't seem to solve. I've put a black down and was able to port that into BO3, but I think as soon as I edit it(add divisions and model something that looks good) then port it, I get an error in APE saying it can read it.

I've exported other parts of it (scaled up cylinders and the perk bottle model) and they worked fine being able to be put into APE. I've been trying for almost 2 days to fix this but I can't. Anyone now how to properly export custom models?