Console error function killing verseperoth

[wafuboe]

When i kill verseperoth i got this error, also i cannot proceed to abyssador boos on warzone 3
got this error on console

heres the script

local versperothPosition = Position(683, 417, 15)

local function removeMinion(mid)
    local monster = Monster(mid)
    if monster then
        monster:getPosition():sendMagicEffect(CONST_ME_POFF)
        monster:remove()
    end
end

local function executeVersperothBattle(mid)
    if getGlobalStorageValue(3147) ~= 1 then
        return
    end

    if mid then
        local monster = Monster(mid)
        if not monster then
            return
        end

        setGlobalStorageValue(3148, monster:getMaxHealth() - monster:getHealth())
        monster:remove()
        versperothPosition:sendMagicEffect(CONST_ME_POFF)

        local position, minionMonster
        for i = 1, math.random(8, 10) do
            position = Position(math.random(674, 693), math.random(408, 424), 15)
            minionMonster = Game.createMonster('Minion of Versperoth', position)
            position:sendMagicEffect(CONST_ME_TELEPORT)
            if minionMonster then
                addEvent(removeMinion, 20 * 1000, minionMonster:getId())
            end
        end
        addEvent(executeVersperothBattle, 10 * 1000)
        return
    end

    local monster = Game.createMonster('Versperoth', versperothPosition, false, true)
    if monster then
        versperothPosition:sendMagicEffect(CONST_ME_GROUNDSHAKER)
        monster:addHealth(-(getGlobalStorageValue(3148) or -1))

        addEvent(executeVersperothBattle, 20 * 1000, monster:getId())
    end
end


function onStepIn(cid, item, position, lastPosition)
    local player = Player(cid)
    if not player then
        return true
    end

    if getGlobalStorageValue(3147) < 1 then
        player:teleportTo(Position(689, 444, 15))
        setGlobalStorageValue(3147, 1)
        setGlobalStorageValue(3148, 0)
        executeVersperothBattle()
        Item(item.uid):transform(18462)
    else
        doPlayerSendCancel(cid, "Wait 30 minutes to start again.")
        player:teleportTo(lastPosition)
        end
    return true
end

 

[wafuboe]

bump

 

[wafuboe]

bump help plz