Lua Bug screen "attempt to concatenate field 'count' (a nil value)"

[Nuckles]

This script:

-- Vendendo Vials por use by warcraftzz

----- Configurações -----
local config = {
cost = 10, -- Dinheiro que ganhara por cada vial vendido DEFAULT 5GPS
item_id = 7635, -- ID DO VIAL
gold_id = 2148, -- ID DO GOLD COIN QUE É 2148 DIGITE 2160 PARA CRYSTAL COIN
}
function onUse(cid, item, frompos, item2, topos)
local count = getPlayerItemCount(cid,7635)
doPlayerRemoveItem(cid,config.item_id,count)
doPlayerAddItem(cid,config.gold_id,config.cost*count)
doPlayerSendTextMessage(cid,22,"Você vendeu ".. config.count .."")
doSendMagicEffect(frompos, 4)
end


The Bug:

[15:11:46.394] [Error - Action Interface]
[15:11:46.394] data/actions/scripts/sellvials3.luanUse
[15:11:46.394] Description:
[15:11:46.394] data/actions/scripts/sellvials3.lua:13: attempt to concatenate field 'count' (a nil value)
[15:11:46.394] stack traceback:
[15:11:46.395] data/actions/scripts/sellvials3.lua:13: in function <data/actions/scripts/sellvials3.lua:9>


Helo plx :s