The model couldn't be Incompatible with MCA reborn's model

I just tested with MCA reborn and it seems to work fine. Make sure you are using the latest version of the mod, because an update was released yesterday with a fix for other player model crashes, and this might have been the same issue.

If it still doesn't work, please provide more information such as a crash log.

The newest version still has the problem that the legs and the fish tails will show up at the same time when using the MCA's player model instead of crushing the game.
English is not my first language. So if I use the wrong word, I'm really sorry for that.