Not Detecting the End of Tracks

[confusedkernel]

As mentioned above, when the track finishes it doesn't automatically skip to the next track.
After a bit of debugging, I found out that it doesn't seem like my current code fires the onTrackEnd event at all.

    public void nextTrack() {
        this.player.startTrack(queue.poll(), false);
        currentSong();
        System.out.println("skipped");
    }

    @Override
    public void onTrackEnd(AudioPlayer player, AudioTrack track, AudioTrackEndReason endReason) {
        System.out.println("does it work?");
        if (endReason.mayStartNext) {
            nextTrack();
            currentSong();
        }
    }

I've searched for any possible solution but so far none of the solutions worked for me, can someone help?
My repository of the bot, the code is in MusicManager.

[MCOfficer]

You need to register your AudioEventAdapter with the player (called TrackScheduler in the example):

lavaplayer/demo-jda/src/main/java/com/sedmelluq/discord/lavaplayer/demo/jda/GuildMusicManager.java

Lines 25 to 26 in 707771a

	scheduler = new TrackScheduler(player);
	player.addListener(scheduler);

Unless I missed something you're not doing that anywhere in your code. You just initialize your AudioEventAdapter, and that's it.