Why isn't this developer Product shop doesn't work?

I got everything sorted out except from giving the Player the gear when he purchase the Dev Product. So Basically the script is suppose to give player the gear if they buy the Developer Product. But it doesn't seems to be giving the Player the gear when they buy it can anyone tell me what wrong with this?

local plr = script.Parent.Parent.Parent.Parent.Parent

local link = game:GetService("MarketplaceService")
deb = 0


script.Parent.MouseButton1Click:connect(function()
local marketId = 21055716 --Here Developer Product ID
link:PromptProductPurchase(plr,marketId)
link.ProcessReceipt = function(receiptInfo)
if Enum.ProductPurchaseDecision.PurchaseGranted and receiptInfo.PlayerId == plr.userId then
if deb == 0 then
deb = 1
local c = game.Lighting.DualVenomshank:Clone()--Here where I'm clonning which is in workspace
    c.Parent = game.Lighting--This put the clone into the Lighting

local give = game.Lighting:FindFirstChild("DualVenomshank")--Here where the script search for "DaulVenomshank"
    give.Parent = game.StarterPack--Here it where it post to give the Player Who bought the "Dev Product" the gear 
wait(1)
deb = 0
end
end
end
end)