Npc Error

[Shippy]

I Got Two Errors That Im Not Sure How To Fix First One Is For Food NPC second one is for Backpack NPC does anyone know how to fix this im using Crying Damson 0.3.6 with the forgottenserver





[03/11/2009 22:52:18] [C]: in function 'error'
[03/11/2009 22:52:18] data/npc/lib/npcsystem/modules.lua:1151: in function 'callbackOnBuy'
[03/11/2009 22:52:18] data/npc/lib/npcsystem/npchandler.lua:263: in function 'processModuleCallback'
[03/11/2009 22:52:18] data/npc/lib/npcsystem/npchandler.lua:440: in function 'onBuy'
[03/11/2009 22:52:18] data/npc/lib/npcsystem/modules.lua:1292: in function <data/npc/lib/npcsystem/modules.lua:1291>