Javacord bot fails to play audio in a voice channel.

When I run my command to join the voice channel and play audio then disconnect, I get this error:

SLF4J: Failed to load class "org.slf4j.impl.StaticLoggerBinder".
SLF4J: Defaulting to no-operation (NOP) logger implementation
SLF4J: See http://www.slf4j.org/codes.html#StaticLoggerBinder for further details.
2021-05-23 15:01:34.429-0700 INFO org.javacord.core.util.gateway.AudioWebSocketAdapter Websocket closed with reason 'unknown' and code NORMAL (1000) by client for AudioConnection (channel: ServerVoiceChannel (id: 760350712353259543, name: General), sessionId: d41a8cfc709285063c6ae30a34dd9806, endpoint: us-west7144.discord.media:443)! {shard=0} 
2021-05-23 15:01:34.498-0700 WARN org.javacord.core.util.handler.guild.VoiceStateUpdateHandler Couldn't get the Channel with the id 0 for a org.javacord.core.util.handler.guild.VoiceStateUpdateHandler. Please update to the latest Javacord version or create an issue on the Javacord GitHub page if you are already on the latest version. {shard=0}

Code:

ServerVoiceChannel sVC = event.getApi().getServerVoiceChannelById(760350712353259543L).get();
sVC.connect().thenAccept(audioConnection -> {
    // Create a player manager
    AudioPlayerManager playerManager = new DefaultAudioPlayerManager();
    playerManager.registerSourceManager(new YoutubeAudioSourceManager());
    AudioPlayer player = playerManager.createPlayer();

    // Create an audio source and add it to the audio connection's queue
    AudioSource source = new LavaPlayerAudioSource(event.getApi(), player);
    audioConnection.setAudioSource(source);

    // Use AudioPlayer like normal LavaPlayer
    playerManager.loadItem("https://youtu.be/YAPzjHObF1A", new AudioLoadResultHandler() {
        @Override
        public void trackLoaded(AudioTrack track) {
            player.playTrack(track);
        }

        @Override
        public void playlistLoaded(AudioPlaylist playlist) {
            for (AudioTrack track : playlist.getTracks()) {
                player.playTrack(track);
            }
        }

        @Override
        public void noMatches() {
            event.getChannel().sendMessage("No matches :(");
        }

        @Override
        public void loadFailed(FriendlyException exception) {
            event.getChannel().sendMessage("Load failed :(");
        }
    });
    audioConnection.close();
});

[ShindouMihou]

I’ll explain it better in his/her place, he/she means your code is triggering AudioConnection#close after selecting a song which basically closes the audio connection between your bot and Discord which in turns makes your bot leave.

The close method is located at the end of the excerpt code you showed.

[Macintosh-Fan]

Well, I did get the audio to successfully play, so it’s all good now.