attempt to index nil with 'PlayerId'?

Hello I Have A Very Confusing Error In My Code Every Time I Tried To Fix It It Would Still Give Me The Error. Anyways This Is A LocalScript In StarterGui The Error Is At Line 6 Please Leave Any Suggestions Down Below.

local MPS = game:GetService("MarketplaceService")
local Players = game:GetService("Players")

script.Parent.Purchase.MouseButton1Click:Connect(function()
	local function ProcessRecipt(RECINFO)
		local PLRREC = Players:GetPlayerByUserId(RECINFO.PlayerId)

		if not PLRREC then
			warn("ERR:USER_PURCHASED_PRODUCT_BUT_LEFT")
			return Enum.ProductPurchaseDecision.NotProcessedYet
		end
		if PLRREC then
			game.Players.LocalPlayer.leaderstats.gold.Value = game.Players.LocalPlayer.leaderstats.gold.Value+1
			warn("USER_PURCHASED_PRODUCT")
			return Enum.ProductPurchaseDecision.PurchaseGranted
		end
	end

	MPS:PromptProductPurchase(game.Players.LocalPlayer,1138765201,false,Enum.CurrencyType.Robux)	
	MPS.ProcessReceipt = ProcessRecipt()
end)

You're calling the function on line 20. Not assigning it to ProcessReceipt.

When you call the function on line 20, you aren't passing any RECINFO parameter. So it errors because there is no PlayerId

Try something like:

MPS.ProcessReceipt = ProcessRecipt({PlayerId = 123456})