Erro ao conjurar spell 'getTileThingByPos'

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local config = {storage = 999999,
cooldown = 60  --- tempo entre um uso e outro
} 

local function isWalkable(pos)
    if getTileThingByPos(pos).itemid == 0 then
        return false
    end

    for i = 0, 255 do
        pos.stackpos = i
        local tile = getTileThingByPos(pos)
        if tile.itemid ~= 0 and not isCreature(tile.uid) then
            if hasProperty(tile.uid, 2) or hasProperty(tile.uid, 7) then
                return false
            end
        end
    end
    return true
end

function onCastSpell(cid, var)
if exhaustion.check(cid, config.storage) then
        doPlayerSendCancel(cid, "Aguarde "..exhaustion.get(cid, config.storage).." segundos.")
        return false
   	end
    local anyPos, pos = {x = 989, y = 1002, z = 7}, getCreaturePosition(cid)
    local toPos = {
        {x = pos.x + 1, y = pos.y, z = pos.z},
        {x = pos.x - 1, y = pos.y, z = pos.z},
        {x = pos.x, y = pos.y + 1, z = pos.z},
        {x = pos.x, y = pos.y - 1, z = pos.z}
    }

    local maxSummons, playerSummons = 5, #getCreatureSummons(cid)
    if maxSummons - playerSummons > 0 then
        for i = 1, maxSummons - playerSummons do
            doCombatAreaHealth(0, 0, anyPos, 0, 0, 0, 255)
            doCreateItem(460, 1, anyPos)

            local bunshin = doCreateMonster("Limbo", anyPos)
            doConvinceCreature(cid, bunshin)
            setCreatureMaxHealth(bunshin, getCreatureMaxHealth(cid))
            doCreatureAddHealth(bunshin, getCreatureHealth(cid))
            --doSetCreatureOutfit(bunshin, getCreatureOutfit(cid), -1)
            --setCreatureName(bunshin, getCreatureName(cid), "a " .. getCreatureName(cid))

            local toPos = isWalkable(toPos[i]) == false and pos or toPos[i]
            doTeleportThing(bunshin, toPos)
            doSendMagicEffect(toPos, CONST_ME_POFF)
        end
    else
        return false
    end
	exhaustion.set(cid, config.storage, config.cooldown)
    return true
end