- last post: 01.01.0001 12:00 AM PDT
....or it means that
A) you tried to join a modded server(where the map is modified), without you having that mod
B) you installed a faulty mod
C) you have a badly installed map. reinstall, and if that doesn't work, tell us if it has an error loading a specific map
D) see mard's sugestion
and mard, Gearbox software makes the mods, don't they?