Why do I have so many errors in my log?

[antonmb]

I can't help with the first error, but the second indicates that you have multiple album artists for the track. Album artist is a unique value for an album and you should have only one. In the example shown, I would make the album artist "Trent Reznor & Atticus Ross." If you want to show the individual artists, you can add them as track artists, where you can have as many artists as you like.