Disconnect:Server using different classtables.

What does this even mean,and how can i fix this?I can’t join ANY servers now.

The server needs to update, or you need to update GMod.

How exactly do i update G Mod then?

Exit, wait a few minutes until Steam pops up saying ‘GMod has finished downloading’ then start Gmod.

It did that,but i still can’t join any servers.

Then the server needs to update. Try joining the Fretta server, as it has plenty of spare slots currently and is updated

Okay, thanks.