Can't run custom maps on own server (CoD4)

[F |Madness| U]

My friend can't run custom maps on his own (non-dedicated) server. We both used the exact same mod (codjumperv3_1) and same custom map, yet I can run them fine and he can't. The maps are downloaded from the same server, so the directory setup should be fine.

Anyway he opens cod4, runs the cj mod, does /g_gametype cj, then /map mp_stalingrad2. When he does this his cod4 crashes and exits, however mine works fine doing the exact same thing. Any ideas? Thanks.

[Pedsdude]

Does it give an error when it crashes? Get him to remove any maps he doesn't need, and the same goes for iwd files inside the codjumperv3_1 directory.