The Avatar deifinition does not match the property path

Hi, my English is not the best so I'll be short. I have a character preab that had some animations to it. I added animations from another bundle and it plays it in Animator, but I need to add a new prop to it (3D model), but when I give 'Add Property' this message pops up.



If you could help, I would be happy: 3

 

In case anyone else comes to this forum looking for a solution.
What worked for me is recreating the "Definition of Avatar" again.
In the model, select Rig and "AnimationType", set it to None again and click Apply.
Then you create again from Humanoid and Create from this model and that's it.
Any referenced animation will still work fine.

It may also be that between one character and the other you have game objects nested differently or some are missing.
Look that everything is the same.

I hope this helps someone.