I wanted to make it so small ammo boxes, from the HL2 beta weapons pack V2 mod, would randomly spawn. So I copied it from the entity tab and pasted it in the NPC box, then added it to the spawn list. When I enable the mod, the ammo doesn't spawn and I keep getting this in the consle:

Class name is bp_small_ammo
lua/autorun/zinv_init.lua:447: attempt to index global 'npc_info' (a nil value)
NPC list is table: 0x376308a8

P.S. to all of you who say this feature wasn't implemented yet, it was. One of the Authors said that it was in a thread asking for it to be made into a feature