FATAL crash on non-convo pack mods

[sampip]

i think i should have noticed this ages ago, but now all of my maps exept for the defaults and the convo pack maps CTD with a FATAL error. it happens on all of my maps, except for my latest map, Alaris Prime. the error message is always the same:
FATAL
Could not open MISSION\***c_con.lvl

(or g_con.lvl)
i don't think it's because i have too many maps, because i tried removing bf zero, which left the convo pack and 6 other mods, and the six mods still crashed. i'm going to try and remove some of my side mods, like BFX, and see if that makes a difference. does anyone have any idea what may be causing this?

[Ping]

Wait, do you have six mods or six maps? If you have six mods, that might be the problem, although I'm not too sure.

[sampip]

i should say six maps, sorry. i managed to fix it though, after a lot of work, i think it was too many side mods in the end. not sure though.