Moving to Trash fails

I've set up a rule that matches certain files in a folder and moves them to the Trash; however it doesn't seem to work. I checked the log, and there are lots of entries like this:
2007-10-28 17:52:32.943 (null)[0] 11078697.m3u: Rule eMusic preview matched.
2007-10-28 17:52:32.947 hazelfolderwatch[248] Caught exception in rule evaluation of file 11078697.m3u: Could not retrieve metadata for file: /.../Downloads/11078697.m3u
Any idea what's going on here?
I'm using Hazel 2.1 (v380), under 10.5
2007-10-28 17:52:32.943 (null)[0] 11078697.m3u: Rule eMusic preview matched.
2007-10-28 17:52:32.947 hazelfolderwatch[248] Caught exception in rule evaluation of file 11078697.m3u: Could not retrieve metadata for file: /.../Downloads/11078697.m3u
Any idea what's going on here?
I'm using Hazel 2.1 (v380), under 10.5