Why does my script say " Argument 2 missing or nil" in my Data Store script?

I have created a Data Store script but when i click Play it does not work and always says "Argument 2 missing or nil"

local DS = game:GetService("DataStoreService")
local myDS = DS:GetDataStore("test")

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

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

    local data
    local success, errormessage = pcall(function()
        data = myDS:setAsync(player.UserId.."-cash")
    end)
    if success then
        cash.Value = data
    else 
        print("There was an error whilst getting your data")
        warn(errormessage)
    end
end)

game.Players.PlayerRemoving:Connect(function(player)
    local success, errormessage = pcall(function()
        myDS:SetAsync(player.UserId.."-cash", player.leaderstats.cash.Value)
    end)
    if success then
        print("Player Data success saved!")
    else
        print("There was an error when saving data")
        warn(errormessage)
    end
end)