[Mailman] Cron <mailman at calypso> /usr/lib/mailman/cron/senddigests

[Cron Daemon]

Traceback (most recent call last):
  File "/usr/lib/mailman/cron/senddigests", line 94, in ?
    main()
  File "/usr/lib/mailman/cron/senddigests", line 87, in main
    mlist.Save()
  File "/usr/lib/mailman/Mailman/MailList.py", line 565, in Save
    self.CheckHTMLArchiveDir()
  File "/usr/lib/mailman/Mailman/Archiver/Archiver.py", line 236, in CheckHTMLArchiveDir
    breaklink(pubdir)
  File "/usr/lib/mailman/Mailman/Archiver/Archiver.py", line 56, in breaklink
    os.unlink(link)
OSError: [Errno 21] Is a directory: '/var/lib/mailman/archives/public/bod'