Why does my script say " Argument 2 missing or nil" in my Data Store script?

I have created a Data Store script but when i click Play it does not work and always says "Argument 2 missing or nil"

local DS = game:GetService("DataStoreService")
local myDS = DS:GetDataStore("test")

game.Players.PlayerAdded:Connect(function(player)
	local leaderstats = Instance.new("Folder")
	leaderstats.Name  = "leaderstats"
	leaderstats.Parent = player
	
	local cash = Instance.new("IntValue")
	cash.Name = "Cash"
	cash.Parent = leaderstats
	
	local data
	local success, errormessage = pcall(function()
		data = myDS:setAsync(player.UserId.."-cash")
	end)
	if success then
		cash.Value = data
	else 
		print("There was an error whilst getting your data")
		warn(errormessage)
	end
end)

game.Players.PlayerRemoving:Connect(function(player)
	local success, errormessage = pcall(function()
		myDS:SetAsync(player.UserId.."-cash", player.leaderstats.cash.Value)
	end)
	if success then
		print("Player Data success saved!")
	else
		print("There was an error when saving data")
		warn(errormessage)
	end
end)