hours is not valid member of Folder "Players.trynotazies.leaderstats" - roblox

Question

For some reason when I am trying to save the data for my leader stats script it says not a valid member. Any help would be appreciated right now. This is for a game I am making on Roblox and hoping for it to grow popular
Here is the code:
local DataStoreService = game:GetService("DataStoreService")
local DataStore = DataStoreService:GetDataStore("DataStore")
game.Players.PlayerAdded:Connect(function(player)
local leaderstats = Instance.new("Folder")
leaderstats.Name = "leaderstats"
leaderstats.Parent = player
local hours = Instance.new("IntValue")
hours.Name = "Hours"
hours.Value = 0
hours.Parent = leaderstats
local Sleep_Tokens = Instance.new("IntValue")
Sleep_Tokens.Name = "Sleep Tokens"
Sleep_Tokens.Value = 0
Sleep_Tokens.Parent = leaderstats
local data
local data2
local success, errormessage = pcall(function()
data = DataStore:GetAsync(player.UserId.."-hours")
data2 = DataStore:GetAsync(player.UserId.."-sleeptokens")
end)
if success then
hours.Value = data
Sleep_Tokens.Value = data2
else
print("Had an error while retrieving player data")
warn(errormessage)
end
end)
game.Players.PlayerRemoving:Connect(function(player)
local success, errormessage = pcall(function()
DataStore:SetAsync(player.UserId.."-hours",player.leaderstats.hours.Value)
DataStore:SetAsync(player.UserId.."-sleeptokens",player.leaderstats.Sleep_Tokens.Value)
end)
if success then
print("Player Data Saved")
else
print("Had an error while saving player data")
warn(errormessage)
end
end)

Answer 1

The error is telling you that hours isn't a child of the player's leaderstats. This is because object names are case-sensitive, and when you created the IntValue, you named it Hours :
local hours = Instance.new("IntValue")
hours.Name = "Hours"
hours.Value = 0
hours.Parent = leaderstats
When you are saving the data, you either need to index the leaderstats using the proper name Hours or change the IntValue's Name to be hours. You'll run into the same issue with Sleep_Tokens.
Try this :
DataStore:SetAsync(player.UserId.."-hours", player.leaderstats.Hours.Value)
DataStore:SetAsync(player.UserId.."-sleeptokens", player.leaderstats["Sleep Tokens"].Value)