Kris glitch help.

I got the kris from zombie mode and I can't use it at all. When I try to equip it when starting a game, e.g. Ghost Mode, I end up shooting a shotgun as a ghost that does no damage. When I try to switch bags to equip the kris, nothing happens, I'm still using the first bag. When I go into another mode, e.g. Team Death Match, I try to switch bags to where I have the kris and I get a client error.

Can anyone please help me with this issue or is it a glitch from crossfire that I can't do anything about?