Can't export using cats and search for bones to merge in custom model creation

<img width="1919" height="1031" alt="Image" src="https://github.com/user-attachments/assets/14db0d1d-eebc-4d1a-9c9f-51d11748f5ee" />
<img width="1919" height="1022" alt="Image" src="https://github.com/user-attachments/assets/830d2476-c4e1-42fa-9e6a-5390cdb1de7f" />
It shows me that for both the problems