i got this error in a script of Wyrms LB


This is the .Lua

Code:
-------------------------------------------------
----------------Y2Quake--------------------
--------------FULL WYRMS LB------------------
-----------------ELITE KNIGHT-----------------------
-------------------------------------------------
--Settings---------------------------------------
MPotID = 268 --- mana potion ID
MinMPots = 50 ---- if less then script will exit spawn
MPots = 500 ----- amount to refill
MPotprice = 50 ---- price of 1 single mana pot
HPotID = 7643 ---- health potion ID
HPotprice = 310 ---- health potion price
HPots = 80 ---- health potions you want to buy
MinHPots = 20 ---- min of health potions to leave
MinCap = 80 ---- if less then script will exit spawn
secondfloor = true ---- 1 if you want to go second floor aswell//  2 if you just want to hunt +1.
------------------------------------------------- 
--END OF SETTINGS--------------------------------



--- DO NOT CHANGE BELOW UNLESS YOU KNOW WHAT YOU'RE DOING ---

registerEventListener(WALKER_SELECTLABEL, "onWalkerSelectLabel")

local info = [[
Free script made by:
    Y2Quake]]
function NpcConv(...)
    for _, str in ipairs(arg) do
        wait((tostring(str):len() / 125) * 60000 * math.random(1.1, 1.8))
        Self.SayToNpc(str)
    end
end 
dofile("Forgee.lua") 
function onWalkerSelectLabel(labelName)
	  if (labelName == "check") then
            delayWalker(1000)
            setWalkerEnabled(false)
            if (Self.ItemCount(MPotID) <= MinMPots) or (Self.Cap() < MinCap) or (Self.ItemCount(HPotID) <= MinHPots) then
                setWalkerEnabled(true)
                gotoLabel("refill")
            else
                setWalkerEnabled(true)
                gotoLabel("checkfloors")
            end
		elseif (labelName == "KeepHunting") then
		print(info)
		elseif (labelName == "bank") then
		setWalkerEnabled(false)
		NpcConv("hi","deposit all","yes","balance")
		wait(900, 1200)
		Self.WithdrawMoney((MPotprice*(MPots-Self.ItemCount(MPotID))))
		wait(900, 1200)
		Self.SayToNpc("yes")
		wait(900, 1200)
		Self.WithdrawMoney((HPotprice*(HPots-Self.ItemCount(HPotID))))
		wait(900, 1200)
		Self.SayToNpc("yes")
		wait(15000,19000)
		setWalkerEnabled(true)
		elseif (labelName == "deposit") then
		setWalkerEnabled(false)
				Self.DepositItems(10281, 816, 8043, 8092, 8045, 9304, 7430, 8027, 7449, 3073, 3415, {9665, 1}, {3028, 1}, {3033, 1})
				wait(1500,1900)
				setWalkerEnabled(true)
		elseif (labelName == "tradepots") then
setWalkerEnabled(false)
wait(900, 1200)
Self.SayToNpc({"Hi", "flasks", "yes", "yes", "yes", "Trade"}, 65)
sleep(math.random(2000, 2400))
buyAlotOfItemsBecauseItsSuchAGodDamnBigDeal(MPotID, (MPots-Self.ItemCount(MPotID)))
sleep(math.random(2000, 2400))
buyAlotOfItemsBecauseItsSuchAGodDamnBigDeal(HPotID, (HPots-Self.ItemCount(HPotID)))
sleep(math.random(2000, 2400))
setWalkerEnabled(true)
		elseif (labelName == "resetbackpacks") then    
		dofile("Forgee.lua") 
		delayWalker(15000)
        resetBackpacks()  
		elseif (labelName == "checkfloors") then
		delayWalker(1000)
		if (secondfloor == true) then
		gotoLabel("goup")
		elseif (secondfloor == false) then
		gotoLabel("KeepHunting")
		end
		elseif (labelName == "check2") then
		if (Self.ItemCount(MPotID) <= MinMPots) or (Self.Cap() < MinCap) or (Self.ItemCount(HPotID) <= MinHPots) then
                setWalkerEnabled(true)
                gotoLabel("refill")
            else
                setWalkerEnabled(true)
                gotoLabel("KeepHunting")
            end
		
end
end

function buyAlotOfItemsBecauseItsSuchAGodDamnBigDeal(item, count)
	count = tonumber(count) or 1
	repeat
		local amnt = math.min(count, 100)
		if(Self.ShopBuyItem(item, amnt) == 0)then
			return printf("ERROR: failed to buy item: %s", tostring(item))
		end
        wait(200,500)
		count = (count - amnt)
	until count <= 0
end

how i fix it ?