I had this on a playlist as well. I had already noticed a problem with this playlist, jemplode had shown a bunch of tracks in the playlist that emplode 2.0b3 didn't "see". Jemplode also complained about 308 errors in the metadata.

Emplode 2.0b7 complained about invalid entries in the playlist and fixed them for me.
_________________________
Remind me to change my signature to something more interesting someday