DataStores can only accept valid UTF-8?

Making a simple datastore but I am running into a simple problem that I cannot figure out right away,

local DataStoreService = game:GetService ("DataStoreService")
local playerdata = DataStoreService:GetDataStore ('PlayerData')

game.Players.PlayerAdded:Connect(function(plr)
	wait()
	local plrkey = "id_"..plr.userId
	local save1 = plr.leaderstats["Points Per Second"]
	local save2 = plr.leaderstats.Points
	local save3 = plr.valueStore["Points Per Second"]
	local save4 = plr.valueStore.Points

	local GetSaved = playerdata:GetAsync(plrkey)
	if GetSaved then
		save1.Value = GetSaved[1]
		save2.Value = GetSaved[2]
		save3.Value = GetSaved[3]
		save4.Value = GetSaved[4]
	else
		local NumberForSaving = {save1.Value, save2.Value, save3.Value, save4.Value}
		playerdata:GetAsync(plrkey, NumberForSaving)
	end
end)

game.Players.PlayerRemoving:Connect(function(plr)
	playerdata:SetAsync("id_"..plr.userId, {plr.leaderstats.Points, plr.leaderstats["Points Per Second"], plr.valueStore.Points, plr.valueStore["Points Per Second"]})
end)

It is giving me a error saying I cannot store Arrays which confuses me because the error is coming from the PlayerRemoving function, this seems simple but I am tired of staring at my screen intensely.