[Anyone can help for 'ammo pickup' tutorial?]

that script wasn't work for me.

i was remove all project and retry that,

but in this time

when i picked ammo, no error message show up and just not response.

anyone can help me for the ammo pickup script?

[Ammo Pickup Script for FPS Pack]

error!

scripts/objects/weapons/ammo pickup.lua" : 6 : attempt to index field 'weapons' (a nil value)

what should i do?

i'm already add 

Script.maxammo=200 --int "Max Ammo"

in FPSgun.lua