Android app crashes or gives error when trying to play synced music: "An error occurred while playing this item"

[KKrimson]

This solved my issue:

- from Plex Web, delete any Sync jobs related to your Android device
- from the authorized devices page, remove the Android device
- on the Android app, clear the app data
- restart the Android app
- find the file to sync
- select download

Taken from here Sync not working - android - for music