Ace not working

when i equip the Ace it dosent equip no matter if i equip it in inventory keybinds 1st or 2nd slot it just dosent work

Does it work with all weapons except Ace?

yes every weapon works except ace : p

Sorry for not answering earlier, I forgot to check the forum.
Well, do you have any mods installed?

no i do not
i usually play on vanilla servers and even in singleplayer vanilla it still dosent work

Try verifying game cache

i will try that

have you been playing around with the files?