I'm having some problems in terms of having a 2nd model in my mod...

So I'm having some problems with my 2nd model not compiling. In my mod there's gonna be a lot of mobs with custom models and so far everything is going smooth except for some reason when I have a mob with this 2nd model I created It says "Your Workspace contains mod elements that don't compile properly" which means I can't download my mod, and can't use the gradle. I don't know why it's doing this because I have a mob that uses a custom model and it works fine. I know it's the models fault because when I change the model to something different it works fine. Some help would be greatly appreciated!