Good day! On a server 1.12.2 with the Sponge, when trying to interact with Music Generator, nothing happens and an error is thrown: https://gist.github.com/PixelmonPRO/9d53db5acc0a34a1fc09d82fb8e00ced

Java: 1.8.0_232
Minecraft Version: Minecraft 1.12.2
Sponge Version: SpongeForge 1.12.2-2838-7.3.0

This issue is related to displaying a message to the player about an empty playlist. Now you will see this message every time you try to interact with Music Generator when no music has been added to the game.

This issue is related to displaying a message to the player about an empty playlist. Now you will see this message every time you try to interact with Music Generator when no music has been added to the game.

I need to add music from the server or client side?
From the client's side, I added 1 music track, there were no problems in the single player game :)

UPD: I figured it out. Music needs to be loaded from the server and client side. If only from the server side, at login it gives an error
UPD 2: Found a bug that when trying to write a disc, 0 track is always recorded: https://www.youtube.com/watch?v=217jiCza6xQ

The problem is your playlist is not same as on the server. Server has it's own playlist and don't care about client's playlist.
So track 1 in your video are not registered on server side and cannot be recorded.