Question about log entry

[manny1602]

My log is filling up with

[4/23/09 10:21:11 AM EDT] WARN FileUtil Failed to list children for e:\mp3\C\Chris de Burgh\The Road to Freedom
[4/23/09 10:21:17 AM EDT] WARN FileUtil Failed to list children for e:\mp3\C\Chris de Burgh\The Road to Freedom
[4/23/09 10:21:19 AM EDT] WARN FileUtil Failed to list children for e:\mp3\C\Chris de Burgh\The Road to Freedom

I've moved the artist folder to my main folder "MP3" and I still get the same warning every few seconds. I've checked the tags and I don't see anything wrong. I've ran the search index several times. No change.
I've run out of ideas.
Any hints what would cause this warning?