Flac errors in system info, moode 5

[Tim Curtis]

Any one explain the following flac errors I am getting in moode 5.0, using Audiophonics ES9038Q2M (pre 2019) driver?

20190419 135719 worker: Ready
   20190419 140141 coverart: flac: /var/lib/mpd/music/NAS/ZyXEL/Flac/Black Sabbath - Paranoid/03  Planet Caravan.flac
   20190419 140141 coverart: flac: Zend media exception: Unknown field: _identifier
   20190419 140141 coverart: flac: /var/lib/mpd/music/NAS/ZyXEL/Flac/Black Sabbath - Paranoid/03  Planet Caravan.flac
   20190419 140141 coverart: flac: Zend media exception: Unknown field: _identifier
   20190419 140316 coverart: flac: /var/lib/mpd/music/NAS/ZyXEL/Flac/Black Sabbath - Paranoid/03  Planet Caravan.flac
   20190419 140316 coverart: flac: Zend media exception: Unknown field: _identifier
   20190419 140316 coverart: flac: /var/lib/mpd/music/NAS/ZyXEL/Flac/Black Sabbath - Paranoid/03  Planet Caravan.flac
   20190419 140316 coverart: flac: Zend media exception: Unknown field: _identifier
   20190419 140322 coverart: flac: /var/lib/mpd/music/NAS/ZyXEL/HiRes/AcDc - Rock or Bust (2014) (24-96)/01-Rock or Bust.flac
   20190419 140322 coverart: flac: Zend media exception: Unknown field: _identifier

Those flac files contain a bad metadata block and this will prevent any embedded cover art from being extracted.

-Tim