[black_eagle]

Well, that would appear to be correct, however as both your OS's are Linux based a permissions issue is quite likely.  If CoreElec is anything like LibreElec then kodi will be running on that as the root user. I know that because of the way my media is stored and shared, Kodi gets mapped as 'nobody' to the shares which means it can't export my library changes because the directories are created by and owned by a different user.  So I have to jump through hoops setting permissions everytime I add music so that the library export works.

php:
2019-04-11 16:30:46.180 T:3911701376 ERROR: Init: Error opening file /Volumes/1.MacDOCS/Music/_iTunes/iTunes Media/Music/The Beatles/Magical Mystery Tour/11 All You Need Is Love.m4a

2019-04-11 16:30:46.180 T:3911701376 ERROR: CAudioDecoder: Unable to Init Codec while loading file /Volumes/1.MacDOCS/Music/_iTunes/iTunes Media/Music/The Beatles/Magical Mystery Tour/11 All You Need Is Love.m4a

2019-04-11 16:30:46.180 T:3911701376 WARNING: PAPlayer::QueueNextFileEx - Failed to create the decoder

2019-04-11 16:30:46.190 T:4066062352 DEBUG: CMusicGUIInfo::InitCurrentItem(/Volumes/1.MacDOCS/Music/_iTunes/iTunes Media/Music/The Beatles/Magical Mystery Tour/11 All You Need Is Love.m4a)

2019-04-11 16:30:46.194 T:4066062352 DEBUG: LoadMusicTag: loading tag information for file: /Volumes/1.MacDOCS/Music/_iTunes/iTunes Media/Music/The Beatles/Magical Mystery Tour/11 All You Need Is Love.m4a

2019-04-11 16:30:46.194 T:4066062352 DEBUG: file /Volumes/1.MacDOCS/Music/_iTunes/iTunes Media/Music/The Beatles/Magical Mystery Tour/11 All You Need Is Love.m4a could not be opened for tag reading

2019-04-11 16:30:46.200 T:4066062352 DEBUG: Loading additional tag info for file /Volumes/1.MacDOCS/Music/_iTunes/iTunes Media/Music/The Beatles/Magical Mystery Tour/11 All You Need Is Love.m4a

2019-04-11 16:30:46.200 T:4066062352 DEBUG: file /Volumes/1.MacDOCS/Music/_iTunes/iTunes Media/Music/The Beatles/Magical Mystery Tour/11 All You Need Is Love.m4a could not be opened for tag reading

2019-04-11 16:30:46.200 T:4066062352 DEBUG: CPlayerGUIInfo::InitCurrentItem(/Volumes/1.MacDOCS/Music/_iTunes/iTunes Media/Music/The Beatles/Magical Mystery Tour/11 All You Need Is Love.m4a)

It is either a path issue or a permissions issue.  Can you navigate to the music files using Kodi's file explorer ?