What does this error mean?

[notswagale (Alee)]

I got this error:

the script:

-- Saves the sudio preferences.

AudioPrefDataStore = game:GetService("DataStoreService"):GetDataStore("AudioPreferences")
local players = game.Players

players.PlayerAdded:Connect(function(player)
	
	local DatastoreKey = "id_"..player.userId
	local AudioPref = AudioPrefDataStore:GetAsync(DatastoreKey)
	
	if AudioPref == nil then
		
		local defSettings = {
			
			["Music"] = false;
			["Effects"] = false
			
		}
		
		local succes, occouredError = pcall(function()

			AudioPref:SetAsync(DatastoreKey, defSettings)

		end)

		if occouredError then

			player:Kick("An error occoured during data connection, please rejoin."..occouredError)

		end
		
	end
	
	local music = AudioPref["Music"]
	local effects = AudioPref["Effects"]
	
	player.Music.Value = music
	player.Effects.Value = effects
	
end)

players.PlayerRemoving:Connect(function(player)

	local DatastoreKey = "id_"..player.userId
	local music = player.Music.Value
	local effects = player.Effects.Value

	local Settings = {
		
		["Music"] = music;
		["Effects"] = effects
		
	}
	
	AudioPrefDataStore:SetAsync(DatastoreKey, Settings)
	
end)

if game:GetService("RunService"):IsStudio() then
	
	else

	game:BindToClose(function()

		for _, player in pairs(players) do

			local DatastoreKey = "id_"..player.userId
			local music = player.Music.Value
			local effects = player.Effects.Value

			local Settings = {
				
				["Music"] = music;
				["Effects"] = effects
				
			}

			AudioPrefDataStore:SetAsync(DatastoreKey, Settings)

		end

	end)

end

[FrieCreeper]

You need to enable API services in game settings.

[notswagale (Alee)]

already enabled, i got the error only one time now it is woring (no changes done to the script)

[notswagale (Alee)]

it was working normally before so i dont know why it happens only certain times

[theseformasentence (kaziel)]

Datastore:GetAsync() has a possibility of erroring. As much as I know, you should also use pcall on ::GetAsync.
You can also use the format

local success, error = pcall(Datastore.GetAsync, Datastore, …)

If you were to use that format, … are parameters of function ::GetAsync, or in your case, the ID for player data

[Judgy_Oreo (DisplayName)]

Have you tried restarting Studio? It might be a network connection issue.

[Judgy_Oreo (DisplayName)]

Yes, but that will not fix the error and the data will still fail to save.

@theseformasentence

pcall(Datastore.GetAsync, Datastore, …)

You disable an optimization by deconstructing the function from Datastore:GetAsync to Datastore.GetAsync(Datastore). I would recommend to just wrap it in an anonymous function instead because I also think it makes more sense.

[notswagale (Alee)]

i think this is the only reason

[theseformasentence (kaziel)]

My practice says to just call one function rather than nesting, unless I am doing more than one action, like calling multiple functions. There isn’t really any optimization issue, just a different way to write it.

[theseformasentence (kaziel)]

I also will add that the error in the screenshot is on line 9, which happens to be where ::GetAsync is called.

[Judgy_Oreo (DisplayName)]

Sorry, I’m just really pedantic. While these two different syntaxes result in the same functionality, one of them (the :) is special behaviour that uses less table accesses than the other, and I just think Table:Function() looks better without the repetition and more “intended” than Table.Function(Table) or Table.Function, Table. That’s just my point of view.

@theseformasentence

I also will add that the error in the screenshot is on line 9, which happens to be where ::GetAsync is called.

Ok… But adding a pcall won’t fix the actual problem. The error would still be there, just hidden behind the pcall, and the data loss issue will still be present. Yes, it’s good to have a pcall around function calls that have a chance of erroring, but you should preface that adding one won’t make the entire system start working again with the data being correctly saved and retrieved.

[theseformasentence (kaziel)]

Yeah. The error itself I am confused about, however the easiest way to work around it would be to kick the player from the server, or attempt calling Datastore:GetAsync() again.
I haven’t gotten error code 0 while working with datastores before.