tfs 0.4 console error

[pepzo]

[Error - Action Interface]
data/actions/scripts/other/keys.lua
Description:
data/actions/scripts/other/keys.lua:2: bad argument #1 to 'pairs' (table expected, got nil)
[Warning - Event::loadScript] Cannot load script (data/actions/scripts/other/keys.lua)

and my keys.lua

REVERSE_DOORS, CHILD_DOORS = {}, {}
for k, v in pairs(DOORS) do
    REVERSE_DOORS[v] = k

    local tmp = getItemInfo(v)
    if(tmp.transformUseTo ~= 0) then
        CHILD_DOORS[tmp.transformUseTo] = k
    end
end

function onUse(cid, item, fromPosition, itemEx, toPosition)
    if(item.aid > 0 and itemEx.aid > 0) then
        if(isPlayerPzLocked(cid) and getTileInfo(toPosition).protection) then
            doPlayerSendDefaultCancel(cid, RETURNVALUE_ACTIONNOTPERMITTEDINPROTECTIONZONE)
            return true
        end

        local doors = DOORS[itemEx.itemid]
        if(not doors) then
            doors = REVERSE_DOORS[itemEx.itemid]
        end

        if(not doors) then
            doors = CHILD_DOORS[itemEx.itemid]
        end

        if(doors) then
            if(item.actionid ~= itemEx.actionid) then
                doPlayerSendCancel(cid, "The key does not match.")
            else
                doTransformItem(itemEx.uid, doors)
            end

            return true
        end
    end

    return false
end

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