Server uses diffrent class tables

[Simple Giant]

Can anyone help me out. I just set up my server for the first time in months, now every time i try to log into it i get this error "Disconnected: Server uses different class tables."

What should i do?

[Beaverbeliever]

Just update your server with the argument -verify_all

[Arjen]

Update your server

[trewq]

Do as said above, it may also be your game is not up to date...