http://musicbrainz.org/edit/21256014
Modbot: "The tracklist has changed since this edit was created, and conflicts with changes made in this edit"

The full edit history of the tracklist in question:
http://musicbrainz.org/release/4c80c2de-82ef-4148-91ec-728f05aa6a8d/edits
Edit #21256014 - Edit medium - change tracklist artist
auto Edit #21256013 - Add medium - disc 2
auto Edit #21256012 - Add medium - disc 1
auto Edit #21256011 - Add release label
auto Edit #21256010 - Add release

I fail to see what caused Edit #21256014 to fail. Regardless of the failure reason, ModBot is not telling the truth, so what's causing it to think the tracklist changed? The edit was entered after the 4 auto-edits which created the release were closed, obviously.

https://musicbrainz.org/edit/21246514 is the edit that caused the issue, but it doesn't appear in the release history.