Why do I have so many errors in my log?

[antonmb]

Error: unexpected end of file at offset 0 in file import/2014-12-09/Dan Auerbach/Keep It Hid/11 My Last Mistake.flac (length 0)

I'm not sure but I think this means the file is corrupted. You may have to re-rip or see if you can verify it's playable on some other device. I seem to recall there was an issue with files converted or ripped with JRiver, were they converted or ripped with JRiver by chance? We may need more expertise than I possess on this.

Warning: ignored conflicting DISCSUBTITLE value Arne Domnérus, Bengt Hallberg, Lars Erstrand, Georg Riedel, Egil Johansen 22:40 in file import/2014-12-09/Arne Domnerus/Jazz at the Pawnshop/Arne Domnerus - Jazz at the Pawnshop - 09 - Stuffy.flac

This indicates that you have an issue with a disc subtitle on the track. If you use disc subtitles , all the tracks in a disc must have the same subtitle.

MinimServer internal error
We may need Simon or someone with more expertise to weigh in on this one as well.

Warning: conflicting ALBUMARTIST values

For albums like this, again the easiest approach is to make the album artist "Emmylou Harris & Rodney Crowell", then set each one as individual track artists. So for all tracks, "Emmylou Harris & Rodney Crowell" is the only album artist, but each track will have two track artists.