Help with custom mob 3d models

Whenever i try and make a 3d model for a mob and import it and use it i get this error message:

Your workspace contains mod elements that don't compile properly.

This was most likely caused by the last mod element you added or edited. try altering the settings of mod elements that cause build errors (such elements are listed below) to try and fix this problem.

and then it just tells me how to get support and gives me a list of elements that are causing errors and the only one there is my entity.

I am using a java model file because json files only work for blocks

pls lmk if im exporting it from blockbench wrong or something