Replacing models with the alpha version.

I remember that in your manual on exporting models, there is that very model of a swordsman, but I keep getting this error. How can I fix it?

Am I expressing my thoughts so poorly in Russian?!

I didn't say that anything needs to be converted anywhere - you just need to take the previously named creature (in the form of an archive, of course) and remove its effects - the axe and shield, and then add the correct texture from the alpha version, where the sword and shield are not transparent!