How to fix error 0012.

I am trying to get back to this server since its been a long time since I joined it but can't connect to it.

This is the Error message popping up.
Kicked: Error 0012: Protocol Violation Detected! Errno.1

How to fix this?

Hello, sorry for the late reply! This error happens when you try joining with 1.4 hairstyle, making a new character should allow you to join