[Mailman-Users] mails stuck in shunt folder

[kamalakannan]

       I have mailman 2.1.9, some of the mails stuck in shunt folder. 
these mails are not delivered even
after using unshunt command.

Below are the errors in mailman log.

Feb 14 13:36:46 2007 (1196) SHUNTING: 
1171438347.6975739+4557e8bc5545704d99fed8f512cd2de377b05e2e
Feb 14 13:36:47 2007 (1196) Uncaught runner exception: unpickling stack 
underflow
Feb 14 13:36:47 2007 (1196) Traceback (most recent call last):
  File "/list/mailman/Mailman/Queue/Runner.py", line 112, in _oneloop
    self._onefile(msg, msgdata)
  File "/list/mailman/Mailman/Queue/Runner.py", line 170, in _onefile
    keepqueued = self._dispose(mlist, msg, msgdata)
  File "/list/mailman/Mailman/Queue/ArchRunner.py", line 73, in _dispose
    mlist.ArchiveMail(msg)
  File "/list/mailman/Mailman/Archiver/Archiver.py", line 215, in 
ArchiveMail
    h = HyperArch.HyperArchive(self)
  File "/list/mailman/Mailman/Archiver/HyperArch.py", line 641, in __init__
    self.__super_init(dir, reload=1, database=db)
  File "/list/mailman/Mailman/Archiver/pipermail.py", line 300, in __init__
    d = pickle.load(f)
UnpicklingError: unpickling stack underflow



Thanks
Kamal