Files doesn't appear on server

[simoncn]

The FLAC specification allows only one Vorbis comment block in a FLAC file. These files have more than one comment block and are therefore not valid FLAC files.

You might be able to fix the problem by running the faulty files though a converter program such as dBpoweramp or XLD (use FLAC to FLAC conversion). This leaves the audio data unchanged and should fix file format issues such as this.