can not buy with credits, !ammo and others not working.

[Peacemaker]

I'm not familiar with "!ammo". What game is it for? What happens when you type the bu, it says invalid item)y command in the console? Does it work if you remove metamod, sourcemod or both?

!ammo is a say command in chat to use your credits to buy ammo.
When I type it nothing.
Its for hl2mp deathmatch.
I tryed that, its still the same. when I do what it tells me after !buy stats
(witch is buy item, it says invalid item).
On other servers they type words like !health and !ammo and use their
credits. It's like something is not on, I searched through all the files.