Problem with the living entity

Hello, I have a problem with my living entity, it doesn't want to apply on Mcreator, and considering the console errors, the problem would be the 3d model, but I don't know how to do it, if anyone can help me, I gladly take this help, I also gives you the errors that the console gave me

PS: As the code is long and the description cannot support that many characters, so I put it in a mediaFire in a text file

Code errors : https://www.mediafire.com/file/8a9fxvpeb040fwf/code+errors.txt/file