Install this uteamcore version and it should work: https://www.curseforge.com/minecraft/mc-mods/u-team-core/files/3843175
You should just read the error.

Originally posted by @HyCraftHD in #391 (comment)

this member clearly does not understand english.
the ticket is about music player not working with new versions of uteamcore.
@HyCraftHD you need to grow some patient and take time when you read the title and descriptions that users post.
understand and think before you reply