Here's my datastore meant to save levels and skillpoints for my game, but it doesn't save. What's wrong with it? 

local DataStoreService = game:GetService("DataStoreService")

local playerData = DataStoreService:GetDataStore("PlayerData")

local function onPlayerJoin(player)
	local leaderstats = Instance.new('Folder')
	leaderstats.Name = 'leaderstats'
	leaderstats.Parent = player
	
	local Level = Instance.new('IntValue')
	Level.Name = 'Level'
	Level.Parent = leaderstats

	local Exp = Instance.new('IntValue')
	Exp.Name = 'Exp'
	Exp.Parent = leaderstats
	

	local HP = Instance.new('IntValue')
	HP.Name = 'Hp'
	HP.Parent = leaderstats
	
	local ST = Instance.new('IntValue')
	ST.Name = 'StrengthPoints'
	ST.Parent = leaderstats
	

	local DP = Instance.new('IntValue')
	DP.Name = 'DodgePoints'
	DP.Parent = leaderstats
	

	local SkillPoints = Instance.new('IntValue')
	SkillPoints.Name = 'SkillPoints'
	SkillPoints.Parent = leaderstats
	
	local playerUserId = 'Player_'..player.UserId
	local data = playerData:GetAsync(playerUserId)
	if data then
		SkillPoints.Value = data["SkillPoints"]
		DP.Value = data["DodgePoints"]
		ST.Value = data["StrengthPoints"]
		HP.Value = data["Hp"]
		Exp.Value = data["Exp"]
		Level.Value = data["Level"]
	else
		SkillPoints.Value = 0
		DP.Value = 0
		ST.Value = 0
		HP.Value = 0
		Exp.Value = 0
		Level.Value = 1
		if Level.Value == 0 then
			Level.Value = 1
		end
	end
end

local function create_table(player)
	local player_stats = {}
	for _, stat in pairs(player.leaderstats:GetChildren()) do
		player_stats[stat.Name] = stat.Value
	end
	return player_stats
end

local function onPlayerExit(player)
	local player_stats = create_table(player)
	local success, err = pcall(function()
		local playerUserId = 'Player_'..player.UserId
		playerData:SetAsync(playerUserId, player_stats)
	end)
	
	if not success then
		warn('Couldnt save data')
	end
end
game.Players.PlayerAdded:Connect(onPlayerJoin)
game.Players.PlayerRemoving:Connect(onPlayerExit)
Anonymous