Nice name ya got there :D
Got the same problem (let me allow to correct you it's version 7 that is expected)
User Interface is version 6, expected 7
This error will appear when a user has the Star Wars Jedi Knight II: Jedi Outcast (v. 1.03) update installed and tries to join a multiplayer game that is running the original version of the game, (v. 1.02a). The updated version of the game is not compatible with the original version.
To check the version number of a multiplayer Star Wars Jedi Knight II: Jedi Outcast game, select the game on the multiplayer server list and click the Server Info button.
Source:
http://support.lucasarts.com/trg/tgd.asp?id=2412&g=120&s=8)
Well and that doesnt help a thing ... who made that patch ? About 5 people I know have the same problem and keep on asking me how to fix it
PLEASE HEEEELP !!!