removing a msg question

I'm fairly new to Mhonarc, but, I've got it up and running fairly smoothly.
 I'm having problems removing a message from the archive though.  I've
checked the msg id, and it's 319  (msg00319.html)

linux:~/MHonArc2.2.0$ mhonarc -rmm 00319
Removing messages from . ...
Warning: Message "319" not in archive


My normal command for updating the archive is:
mhonarc -add -outdir /home/mhonarc/public_html/archive /home/monarch/Mailbox

Any ideas?  Thanks.

Steve