Lua Error closingdoor.lua

[JohnnyPark]

I am having this error on my distro:

How to fix it?

My closingdoor.lua

function onStepOut(cid, item, position, fromPosition)
    local newPosition = {x = position.x, y = position.y, z = position.z}
    if(isInArray(verticalOpenDoors, item.itemid)) then
        newPosition.x = newPosition.x + 1
    else
        newPosition.y = newPosition.y + 1
    end

    doRelocate(position, newPosition)
    local tmpPos = {x = position.x, y = position.y, z = position.z, stackpos = -1}
    local tileCount = getTileThingByPos(tmpPos)

    local i = 1
    local tmpItem = {uid = 1}
    while(tmpItem.uid ~= 0 and i < tileCount) do
        tmpPos.stackpos = i
        tmpItem = getTileThingByPos(tmpPos)
        if(tmpItem.uid ~= item.uid and tmpItem.uid ~= 0 and isMoveable(tmpItem.uid)) then
            doRemoveItem(tmpItem.uid)
        else
            i = i + 1
        end
    end

    doTransformItem(item.uid, item.itemid - 1)
    return true
end