Model preventing living entity from saving

My code - https://pastebin.com/dR3qHxdC

I'm importing a fairly complicated model for my mod, but it gives me an error whenever I try to apply the model. Importing it is fine, it's just when I save it, every part of the model has an error. I've been stuck on this for a while, and I would like some help with it.

Build log - https://pastebin.com/YhvxryzY

Thanks in advance.