Apple Music Sync Error: 'Genius results can’t be updated right now. The network connection was lost.'

Finally everything looks fine, though it has been tough to get it fixed. I am not sure if it is me or the apple side that get it fixed, but this is what I did:

1. I do remember I have output my library and one playlist that disappeared on my other devices but is still on my mac to file. But perhaps we can find a library file before I did this. I did this when the apple music is syncing forever with error messages for tons of songs, but at this moment the output files are complete.
2. I find it is the step "" that hangs forever, and this is what I find https://discussions.apple.com/thread/3534198?answerId=16908298022#16908298022 (see tmksnyder's answer, sorry I do not know how to properly cite this). The apple music is using extremely high CPU, but I am still not sure which file is wrong.
3. Sign out, quit music, sign in again. Now the cloud library is not syncing at all and the error code is 9039
4. Finally, I tried this https://developer.apple.com/forums/thread/15533 (Max's answer). And I choose create a new library, and import the files (library and the disappeared playlist) I mentioned in the first step. And now everything looks good and I can also upload my own music to the cloud right now. The disappeared playlist also shows up on my other devices. Then it looks that the original problem was caused by something crashed in the original library.

Opening iTunes while you hold the option key (shift key for Windows) if it works, this will create a new library and you can copy/move your music etc. over by using the "Add to Library" option under the file menu.