@CBA_CO (I suppose that's what you are running?) requires the beta patch of Arma 2. If you don't want to use the beta, you need to run @CBA and @CBA_A2 and @CBA_OA. Get them from this link.
Edit - If you are running just @CBA_OA, run also @CBA and @CBA_A2 and youll be all set.
Edit - If you are running just @CBA_OA, run also @CBA and @CBA_A2 and youll be all set.
The fewer men, the greater share of honor