Lua question error what is and how to solve

[dervin13]

Someone knows how to solve and what is it?

Lua Script Error: [Npc interface]
(Unknown scriptfile)
data/npc/lib/npcsystem/modules.lua:1012: [ShopModule.onSell] items[itemid] == nil

parte of the code

    function ShopModule:callbackOnSell(cid, itemid, subType, amount, ignoreEquipped, _)
        local shopItem = self:getShopItem(itemid, subType)
        if shopItem == nil then
            error("[ShopModule.onSell] items[itemid] == nil")
            return false
        end

        if shopItem.sell == -1 then
            error("[ShopModule.onSell] attempt to sell a non-sellable item")
            return false
        end

 

[mackerel]

can you tell me what you trying to do while in game before this message appears?

make sure you have the updated module function (this is latest TFS)