Lua Upgrade System TFS 0.4

[ssiwyy158]

TFS 0.4

Hello. I use this script:

    local conf = {}
    conf["level"] = {
    [1] = {successParcent = 100, downrageLevel = 0},
    [2] = {successParcent = 65, downrageLevel = 1},
    [3] = {successParcent = 40, downrageLevel = 2},
    [4] = {successParcent = 20, downrageLevel = 3},
    [5] = {successParcent = 10, downrageLevel = 4},
    }
    conf["upgrade"] = {
    attack = 1,
    extraAttack = 2,
    defense = 1,
    extraDefense = 2,
    armor = 1,
    hitChance = 1,
    }
   
    local upgrading = {
    upValue = function (value, level, parcent)
    if(not(value>0))then return 0 end
    for i=1,level do
    value = math.ceil(((value/100)*parcent)+value)+1
    end
    return (value > 0) and value or 0
    end,
    getLevel = function (item)
    local name = string.explode(getItemName(item), '+')
    return (#name == 1) and 0 or math.abs(name[2])
    end,
    }
    function onUse(cid, item, fromPosition, itemEx, toPosition)
    local getItem = getItemInfo(itemEx.itemid)
    if((getItem.weaponType > 0 or getItem.armor > 0) and not isItemStackable(itemEx.itemid))then
    local level = upgrading.getLevel(itemEx.uid)
    if(level < #conf["level"])then
    local nLevel = (conf["level"][(level+1)].successParcent >= math.random(1,100)) and (level+1) or conf["level"][level].downrageLevel
    if(nLevel > level)then
    doSendMagicEffect(toPosition, 28)
    doPlayerSendTextMessage(cid, 22, "Upgraded was successful!")
    else
    doSendMagicEffect(toPosition, 6)
    doPlayerSendTextMessage(cid, 22, "Upgrading fail!")
    doRemoveItem(itemEx.uid)
    end
    doItemSetAttribute(itemEx.uid, "name", getItem.name..((nLevel>0) and "+"..nLevel or ""))
    doItemSetAttribute(itemEx.uid, "attack", upgrading.upValue(getItem.attack, nLevel, conf["upgrade"].attack))
    doItemSetAttribute(itemEx.uid, "extraattack", upgrading.upValue(getItem.extraAttack, nLevel, conf["upgrade"].extraAttack))
    doItemSetAttribute(itemEx.uid, "defense", upgrading.upValue(getItem.defense,nLevel, conf["upgrade"].defense))
    doItemSetAttribute(itemEx.uid, "extradefense", upgrading.upValue(getItem.extraDefense, nLevel, conf["upgrade"].extraDefense))
    doItemSetAttribute(itemEx.uid, "armor", upgrading.upValue(getItem.armor, nLevel, conf["upgrade"].armor))
    doItemSetAttribute(itemEx.uid, "hitChance", upgrading.upValue(getItem.hitChance,nLevel, conf["upgrade"].hitChance))
    doRemoveItem(item.uid, 1)
    else
    doPlayerSendTextMessage(cid, 19, "Sorry this item is on max level.")
    end
    else
    doPlayerSendTextMessage(cid, 19, "You cannot upgrade this item.")
    end
    end

When the item will be destroyed, Errors appear :

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[Infernum]

after doRemoveItem(itemEx.uid) (line 43)
add return true