Works on SP, not on Co-op

Hi, i am trying to play on this map (however it crashes on all maps):
 New_Realism_IE_V1.0 (1)

I launch the game, load the mod, hit start, i get 3/4 of the way though the loading screen it freezes up then crashes.
If i play in co-op it does the same thing...

I have in...