Save data will not work with API on. What is Wrong?

I have been learning studio for the past week or so (very new to it) and I can NOT get my save data to work correctly. For some reason it worked twice but on the third test it no longer worked. What is missing or in the wrong place here? If anyone has any ideas please let me know! and yes, API services are on!

local DataStoreService = game:GetService("DataStoreService")

local CashStore = DataStoreService:GetDataStore("Cash")

local player = game.Players.LocalPlayer

local STARTING_CASH = 100

local function onPlayerAdded(player)

local playerKey = "Player\_" .. player.UserId

print("User ".. player.UserId.. " Joined")

local leaderstats = Instance.new("Folder")

leaderstats.Name = "leaderstats"

leaderstats.Parent = player

local Cash = Instance.new("IntValue")

Cash.Name = "Cash"

Cash.Parent = leaderstats

local myCash

local success, err = pcall(function()
myCash = CashStore:GetAsync(playerKey) or STARTING_CASH

end)

if success then

    Cash.Value = myCash

    print("loading "..myCash)

else

    print("failed to retrieve data")

    warn(err)

end
end

game.Players.PlayerAdded:Connect(onPlayerAdded)

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local function onPlayerLeft(player)

local playerKey = "Player\_" .. player.UserId

local myCash = player.leaderstats.Cash.Value

print(myCash)

local success, err = pcall(function()

    myCash = CashStore:SetAsync(playerKey, myCash)

end)

    if success then

        print("User "..playerKey.." saved with "..myCash.." in the bank")

    else

        print("error")

        warn(err)

    end
end

game.Players.PlayerRemoving:Connect(onPlayerLeft)