ERRO NA SOURCE (SCRIPT DE REFINAMENTO)

[4/2/2019 15:45:46] [Error - Action Interface] 
[4/2/2019 15:45:46] data/actions/scripts/upgrade.lua:onUse
[4/2/2019 15:45:46] Description: 
[4/2/2019 15:45:46] data/actions/scripts/upgrade.lua:76: attempt to call global 'getItemAttack' (a nil value)
[4/2/2019 15:45:46] stack traceback:
[4/2/2019 15:45:46]     data/actions/scripts/upgrade.lua:76: in function 'doTransform'
[4/2/2019 15:45:46]     data/actions/scripts/upgrade.lua:99: in function <data/actions/scripts/upgrade.lua:85>

[4/2/2019 15:45:51] [Error - Action Interface] 
[4/2/2019 15:45:51] data/actions/scripts/upgrade.lua:onUse
[4/2/2019 15:45:51] Description: 
[4/2/2019 15:45:51] data/actions/scripts/upgrade.lua:47: attempt to call global 'getItemArmor' (a nil value)
[4/2/2019 15:45:51] stack traceback:
[4/2/2019 15:45:51]     data/actions/scripts/upgrade.lua:47: in function 'isArmor'
[4/2/2019 15:45:51]     data/actions/scripts/upgrade.lua:90: in function <data/actions/scripts/upgrade.lua:85>

PESSOAL, ESTOU COM UM SCRIPT DE REFINAMENTO E ESTÁ OCORRENDO ESSE ERRO ACIMA.

SCRIPT ABAIXO:

--- Perfect refine system by Mock the bear (MTB).
--- Email: [email]mock_#####@hotmail.com[/email]
local gain = {
gainArmor='&p+1',loseArmor='&p-1',
gainShield='&s+#',loseShield='&s-(#+1)',
gainAttack='&a+(2*(#))',loseAttack='&a-(2*(#+1))',
gainDefense='&d+(2*(#))',loseDefense='&d-(2*(#+1))',
chance='100/((#*(1/(@/2)))*(@/2))',  -- Eu fiz essa equação para variar de +0 a +7 o item
--- Essa equação deve retornar em % a chance do item se refinar (0-100) 100 = sempre, 0 = nunca
maxlvl = 20,
blocked_ids = {}
}
-- &a = weapon attack
-- &d = weapon defense
-- &s = shield defense
-- &p = armor defense
-- # = nivel do item
-- @ = max level
if not setItemName then
       function setItemName(uid,name)
        return doItemSetAttribute(uid,'name',name)
       end
       function setItemArmor(uid,name)
        return doItemSetAttribute(uid,'armor',name)
       end
       function setItemDefense(uid,name)
        return doItemSetAttribute(uid,'defense',name)
       end
       function setItemAttack(uid,name)
        return doItemSetAttribute(uid,'attack',name)
       end
       function getItemAttack(uid)
          return getItemAttribute(uid,'attack')
       end
       function getItemDefense(uid)
          return getItemAttribute(uid,'defense')
       end
       function getItemArmor(uid)
          if type(uid) == 'number' then
                 return getItemAttribute(uid,'armor')
          else
                 return getItemInfo(uid.itemid).armor
          end
       end
end
function isArmor(uid) -- Function by Mock the bear.
        if (getItemArmor(uid) and getItemArmor(uid) ~= 0 and not getItemInfo(uid.itemid,'attack') and not getItemInfo(uid.itemid,'defense') and getItemWeaponType(uid.uid) == 0) then
           return true
        end
        return false
end
function isWeapon(uid) -- Function by Mock the bear.
        uid = uid or 0
        local f = getItemWeaponType(uid)
        if f == 1 or f == 2 or f == 3 then
            return TRUE
        end
        return FALSE
end
function isShield(uid) -- Function by Mock the bear.
        uid = uid or 0
        if getItemWeaponType(uid) == 4 then
            return TRUE
        end
        return FALSE
end

function getWeaponLevel(uid) -- Function by Mock the bear.
  uid = uid or 0
  local name = getItemName(uid)
  local lvl = string.match(name,'+(%d)')
  return tonumber(lvl) or 0
end
function doTransform(s,i) -- Function by Mock the bear.
   local c = string.gsub(s,'@',gain.maxlvl)
   local c = string.gsub(c,'&a',getItemAttack(i.uid) or getItemInfo(i.itemid).attack)
   local c = string.gsub(c,'&d',getItemDefense(i.uid) or getItemInfo(i.itemid).defense)
   local c = string.gsub(c,'&s',getItemDefense(i.uid) or getItemInfo(i.itemid).defense)
   local c = string.gsub(c,'&p',getItemArmor(i.uid) or getItemInfo(i.itemid).armor)
   local c = string.gsub(c,'#',getWeaponLevel(i.uid))
   local q,err = loadstring('return '..c)
   assert(q,err)
   return assert(q())
end
function onUse(cid, item, fromPosition, itemEx, toPosition)
        toPosition.stackpos = 255
        if isInArray(gain.blocked_ids, itemEx.itemid) == TRUE
         or getItemWeaponType(itemEx.uid) > 4
          or (getItemWeaponType(itemEx.uid) == 0
           and isArmor(itemEx) == FALSE)
            or itemEx.itemid == 0 then
               doPlayerSendTextMessage(cid, 24,"You cant refine this item.")
               return TRUE
        end
        if isCreature(itemEx.uid) == TRUE then
           return FALSE
        end
       local level = getWeaponLevel(itemEx.uid)
       local chance = doTransform(gain.chance,itemEx)
       if chance >= math.random(0,100) or item.actionid >= 1000 or (item.actionid == 500 and math.random(0,100) <= 25) then
          if level+1 > gain.maxlvl then
             doSendMagicEffect(toPosition, 2)
             return doPlayerSendTextMessage(cid, 24,"Your item is on max level, you can't upgrade it.")
          else
             setItemName(itemEx.uid, getItemNameById(itemEx.itemid)..' +'..(level+1))
             doPlayerSendTextMessage(cid, 24,"Your item has been upgrated to +"..(level+1)..".")
             doSendMagicEffect(toPosition, 12)
             if isArmor(itemEx) == TRUE then
                local get = doTransform(gain.gainArmor,itemEx)
                setItemArmor(itemEx.uid,get)
             elseif isWeapon(itemEx.uid) == TRUE then
                 setItemAttack(itemEx.uid, doTransform(gain.gainAttack,itemEx))
                 setItemDefense(itemEx.uid, doTransform(gain.gainDefense,itemEx))
             elseif isShield(itemEx.uid) == TRUE then
                 setItemDefense(itemEx.uid, doTransform(gain.gainShield,itemEx))
             end
          end
       else

          if level == 0 then
              doPlayerSendTextMessage(cid, 24,"No effect.")
              doSendMagicEffect(toPosition, 2)
          elseif level == gain.maxlvl then
                 doSendMagicEffect(toPosition, 2)
                 return doPlayerSendTextMessage(cid, 24,"Your item is on max level, you can't upgrade it.")
          elseif level > 0 then
              if level == 1 then
                  setItemName(itemEx.uid, getItemNameById(itemEx.itemid))
                  doPlayerSendTextMessage(cid, 24,"Your item back to normal.")
              else
                  setItemName(itemEx.uid, getItemNameById(itemEx.itemid)..' +'..(level-1))
                  doPlayerSendTextMessage(cid, 24,"Your item back to +"..(level-1)..".")
              end
             if isArmor(itemEx) == TRUE then
                setItemArmor(itemEx.uid,doTransform(gain.loseArmor  ,itemEx))
             elseif isWeapon(itemEx.uid) == TRUE then
                 setItemAttack(itemEx.uid, doTransform(gain.loseAttack,itemEx))
                 setItemDefense(itemEx.uid, doTransform(gain.loseDefense,itemEx))
             elseif isShield(itemEx.uid) == TRUE then
                 setItemDefense(itemEx.uid, doTransform(gain.loseShield,itemEx))
             end
          end
          doSendMagicEffect(toPosition, 9)
       end
    doRemoveItem(item.uid,1)
    return TRUE
end