leaderstats is not a valid member of Player?

Yesterday i was working on a new game (my first one as you could probably tell) but the code and everything worked fine yesterday and didnt change anything after that anymore, now that i want to continue working today i try running the game to make sure everything is still fine and i get met with the message: leaderstats is not a valid member of Player and i dont know whats wrong, could someone help? heh. again. Thanks!

local DataStore = game:GetService("DataStoreService")
local PointsData = DataStore:GetOrderedDataStore("Points")

game.Players.PlayerAdded:Connect(function(player)
    local points = PointsData:GetAsync(player.UserId)
    local leaderstats = Instance.new("Folder")
    leaderstats.Name = "leaderstats"
    local pointsValue = Instance.new("IntValue",leaderstats)
    pointsValue.Value = points
    leaderstats.Parent = player
    pointsValue.Name = "Strength"
end)

game.Players.PlayerRemoving:Connect(function(player)
    local strength = player.leaderstats.Strength.Value
    PointsData:UpdateAsync(player.UserId, strength)
    print("Saved Data!")
end)

game.ReplicatedStorage.BuyItem.OnServerEvent:Connect(function(player,weight)
    if player.leaderstats.Strength.Value >= weight.Price.Value then
        player.leaderstats.Strength.Value = player.leaderstats.Strength.Value - weight.Price.Value
        local newWeight = weight:Clone()
        local oldWeight = player.Backpack:FindFirstChildOfClass("Tool")or player.Character:FindFirstChildOfClass("Tool")
        oldWeight:Destroy()
        newWeight.Parent = player.Backpack
    end
end)