Lua Problem with NPC trade

[nowayrlz]

I'm using OTServ 0.6.4 for 8.6, I got a global map w/ npcs but I'm unable to buy anything from them.

Any tips on how to solve this? I already tried replacing libs of different ots but always error.

Spoiler: ERROR

Lua Script Error: [Npc interface]
(Unknown scriptfile)

data/npc/scripts/lib/npcsystem/npchandler.lua:265: bad argument #1 to 'unpack' (table expected, got nil)
stack traceback:
[C]: in function 'unpack'
data/npc/scripts/lib/npcsystem/npchandler.lua:265: in function 'processModuleCallback'
data/npc/scripts/lib/npcsystem/npchandler.lua:467: in function 'onBuy'
data/npc/scripts/lib/npcsystem/modules.lua:903: in function <data/npc/scripts/lib/npcsystem/modules.lua:903>

npcsystem.lua: http://pastebin.com/tEakrsiu
npchandler.lua: http://pastebin.com/k8p4jt8a
modules.lua: http://pastebin.com/cMkDqPum
keywordhandler.lua: http://pastebin.com/LerznDWu

in case you need the shop script: http://pastebin.com/v4bWx0ER

 

[nowayrlz]

Nevermind, I just solved my problem,
In case anyone step at similar thing here it is:

elseif(id == CALLBACK_ONBUY and module.callbackOnBuy ~= nil) then
                tmpRet = module:callbackOnBuy(unpack(arg))

magic arg is deprecated in Lua 5.1 and you should replace by {...}
Working code:

elseif(id == CALLBACK_ONBUY and module.callbackOnBuy ~= nil) then
                tmpRet = module:callbackOnBuy(unpack({...}))