Why isn't my newer DataStore not load/saving any data?

I recently changed up my DataStore System and was wondering why is wasn't working (I have tried this out of studio)any ideas? any help would be appreciated

local DataStoreService = game:GetService("DataStoreService")
local DATA = DataStoreService:GetDataStore("DATA")

game.Players.PlayerAdded:Connect(function(player)
    local leaderstats = Instance.new("Folder")
    leaderstats.Name = "leaderstats"
    leaderstats.Parent = player

    local cash = Instance.new("NumberValue")
    cash.Name = "Cash"
    cash.Parent = leaderstats

    local data
    local success, errormessage = pcall (function()
        data = DATA:GetAsync(player.UserId.."-cash")
    end)
    if success then
        cash.Value = data
    else
        print("An error occurred while loading player data")
        warn(error)
    end

end)

game.Players.PlayerRemoving:Connect(function(player)

    local success, errormessage = pcall (function()
        DATA:SetAsync(player.UserID.."-cash",player.leaderstats.Cash.Value)
    end)

    if success then
        print("Player Data successfully saved!")
    else
        print("An error occurred while saving player data")
        warn(errormessage)
    end

end)

The Script is named Script

Edit:I am getting a console error of couldn't identity player.UserId