[Mailman] Cron <mailman@spoon> /usr/bin/python2.2 -S /opt/mailman/cron/senddigests

[Cron Daemon]

Traceback (most recent call last):
  File "/opt/mailman/cron/senddigests", line 94, in ?
    main()
  File "/opt/mailman/cron/senddigests", line 87, in main
    mlist.Save()
  File "/opt/mailman/Mailman/MailList.py", line 494, in Save
    self.__lock.refresh()
  File "/opt/mailman/Mailman/LockFile.py", line 223, in refresh
    raise NotLockedError, '%s: %s' % (repr(self), self.__read())
Mailman.LockFile.NotLockedError: <LockFile 137420260: /opt/mailman/locks/pdns-users.lock [unlocked: 18000sec] pid=27813>: None