How to make my Datastore load the player's Cash?

Script so when the player joins the game, it gives the leaderstats folder + the Cash value inside

function onPlayerEntered(newPlayer)
    wait()
    local stats = Instance.new("Folder")
    stats.Name = "leaderstats"

    local score = Instance.new("IntValue")

    score.Name = "Cash"
    score.Value = 0

    score.Parent = stats    
    stats.Parent = newPlayer
end

game.Players.ChildAdded:connect(onPlayerEntered)

Datastore Script

local ds = game:GetService("DataStoreService"):GetDataStore("CashData")

game.Players.PlayerAdded:Connect(function(plr) --Load

    wait(0.2)

    local plrkey = "id_"..plr.userId
    local leaderstats = plr:WaitForChild("leaderstats")
    local cash = leaderstats:WaitForChild("Cash")

    local GetSaved = ds:GetAsync(plrkey)

    if GetSaved then
        cash.Value = GetSaved[1]
    else
        local NumberForSaving = {cash.Value}
        ds:GetAsync(plrkey, NumberForSaving)
    end

    while wait(300) do --AutoSave
        ds:SetAsync("id_"..plr.userId, {plr.leaderstats.Cash.Value})
    end
end)

game.Players.PlayerRemoving:Connect(function(plr) --Save
    local leaderstats = plr:WaitForChild("leaderstats")
    local cash = leaderstats:WaitForChild("Cash")
    ds:SetAsync("id_"..plr.userId, {cash.Value})
end)

[Error is from the Datastore script]:

"ServerScriptService.CashDatastore:14: attempt to index number with number"