Animated Java Model Files Not Working (Made and Animated in Blockbench)

Thanks to this forum I figured out how to animate mobs using Blockbench!

The problem is that I keep getting errors when I use animated java files; they don't compile correctly. Instead of pasting the contents of the file here, I've uploaded it to Google Drive:

https://drive.google.com/file/d/1Oq-Ub7SgeMNHfMxa8r1TOQ7Z3WAq7iFl/view?…

The workspace itself is here:

https://drive.google.com/file/d/1NzQQmL3i_jrNJFnHxktfwMa4uvdWydgn/view?…