Datastorage does not save data when leaving, how to fix?

I tried making my own script but after several hours and many fails i searched a tutorial. I followed all the steps and changed the stats to my own. I dont know if you should add any stringvalues or anything, as for now i just have this script:

local DataStoreService = game:GetService("DataStoreService")

local playerData = DataStoreService:GetDataStore("PlayerData")





local function onPlayerJoin(player)  -- Runs when players join

	local leaderstats = Instance.new("Folder")  --Sets up leaderstats folder

	leaderstats.Name = "leaderstats"

	leaderstats.Parent = player



	local gold = Instance.new("IntValue") --Sets up value for leaderstats

	gold.Name = "Coins"

	gold.Parent = leaderstats



	local playerUserId = "Player_" .. player.UserId  --Gets player ID

	local data = playerData:GetAsync(playerUserId)  --Checks if player has stored data

	if data then

		-- Data exists for this player

		gold.Value = data

	else

		-- Data store is working, but no current data for this player

		gold.Value = 0

	end

end



local function onPlayerExit(player)  --Runs when players exit



	local success, err = pcall(function()

		local playerUserId = "Player_" .. player.UserId

		playerData:SetAsync(playerUserId, player.leaderstats.Gold.Value) --Saves player data

	end)



	if not success then

		warn('Could not save data!')

	end

end



game.Players.PlayerAdded:Connect(onPlayerJoin)

game.Players.PlayerRemoving:Connect(onPlayerExit)

If you are testing and you are the only one in you server, the server shuts down when you leave and the code wont run. To prevent this, add another block of code that includes this

game:BindToClose(function()
	for _, player in pairs(game.Players:GetPlayers()) do

		local Id = "player_"..player.UserId
  		local Data = player.leaderstats.Cash.Value

    		local success, errormessage = pcall(function()
        	DataStore1:SetAsync(Id, Data)
        		print("DataSaved")
    		end)

   		if success then
        		print("DataSaved")
		elseif errormessage then
			print("There was a error")
warn(errormessage)
		end
	end
end)

Put this under your other code