[Mailman-Developers] Uh oh, import error on ArchiverMailbox with 2.1a3

[Bob Puff@NLE]

This just came on my screen:

Traceback (most recent call last):
  File "/home/csc/mailman/Mailman/Archiver/Archiver.py", line 181, in ArchiveMail
    import HyperArch
  File "/home/csc/mailman/Mailman/Archiver/HyperArch.py", line 41, in ?
    import HyperDatabase
  File "/home/csc/mailman/Mailman/Archiver/HyperDatabase.py", line 30, in ?
    import pipermail
  File "/home/csc/mailman/Mailman/Archiver/pipermail.py", line 18, in ?
    from Mailman.Mailbox import ArchiverMailbox
ImportError: cannot import name ArchiverMailbox