Can't join spacebuild 2 servers.

Hey.

Whenever I try to join several of the SB2 servers I frequent, Directly after “Sending client info…” Dissapears, I get a message saything something like “Disconected from server: The server had a different class base.” Or some such. I haven’t tried it on that many other servers, but it seems to only effect space build 2.

Does anyone know why this is?

If it was today, the servers haven’t updated.