Playlist Warning - But Playlist Plays

[18-05-16 07:41:30.0092] Slim::Formats::Playlists::Base::playlistEntryIsVal id (125) Warning: file:///share/Qmultimedia/Music/Playlists/%EF%BB%BF%23EXTM3U found in playlist:
file:///share/Qmultimedia/Music/Playlists/Hiatt-Zevon.m3u doesn't exist on disk - skipping!
[18-05-16 07:41:30.0102] Slim::Formats::Playlists::Base::playlistEntryIsVal id (125) Warning: file:///share/Qmultimedia/Music/FLAC/%EF%BB%BF%23EXTM3U found in playlist:
file:///share/Qmultimedia/Music/Playlists/Hiatt-Zevon.m3u doesn't exist on disk - skipping!

What do these warnings mean? The 'Hiatt-Zevon' playlist plays fine.