3d texture causing problems with client

This is my first time making a mob and I’m using blockbench for 3D models. So I made the mob and turned on the client,  it loaded as usual but then showed a page that was only the mojang logo and a progress bar. The bar loaded most of the way and froze. I troubleshooted a bit and found it was the 3D texture that was causing the problem. Can I have some help please? 🥺