the client gives errors when loading a map

[luaman]

everything is working (except for the shop and clan, but they apparently aren't finished)
but:
i get this weird error when trying to load ANY map
it says that the level is incompatible with the client, and to "try reprocessing it"

...help?

 

[Zenshin112]

Did you use new suddenattack maps Or maps from other lithtech games?
A screenshot would be useful.