ak47 bug ammo and bug 2 weapons

When player buy this item need to reward 1 ammo packs on every 1000 dmg hp. The dmg hp = zp_human_damage_reward 1000 // How much damage humans must deal on zombies to get an ammo pack

Not work :S

Only in compile ...
zp_extra_silver_ak47.sma(106) : error 017: undefined symbol "Attacker"
zp_extra_silver_ak47.sma(106) : error 017: undefined symbol "Attacker"
zp_extra_silver_ak47.sma(109) : error 017: undefined symbol "Attacker"
zp_extra_silver_ak47.sma(109 -- 110) : warning 215: expression has no effect
But i change:
zp_set_user_ammo_packs(Attacker, zp_get_user_ammo_packs(Attacker) + 1)

// Reset again.
fValue[Attacker] = 0.0
--->
zp_set_user_ammo_packs(attacker, zp_get_user_ammo_packs(attacker) + 1)

// Reset again.
fValue[attacker] = 0.0

Not work correctly.

Human deal 5400 dmg with this item and reward only 3 ammo packs... but real reward need be 5
zp_human_damage_reward 1000 // How much damage humans must deal on zombies to get an ammo pack

Not work.