The Pehkui mod doesn`t work on my server (srry for bad english)

When the game tries to change player`s size for Medieval origins mod, some kind of error occurs in the code. I have no idea what this means and how to fix it. Everything else seems fine, the server is running smoothly. It`s just the size thingy that doesn`t work. I think this is how you attach the server`s log? Please help me if I did something wrong