ERROR: Backend could not find uid for message, returned 0

[Dave Abrahams]

Any idea what this means?

--8<---------------cut here---------------start------------->8---
pluto:/usr/local/stow dave% offlineimap -k accounts=AllMail 2>&1 | tee ~/work/offlineimap.23.log
OfflineIMAP 6.5.2.1
  Licensed under the GNU GPL v2+ (v2 or any later version)
Account sync AllMail:
 *** Processing account AllMail
 Establishing connection to imap.gmail.com:993
 Establishing connection to tunnel:/usr/local/libexec/dovecot/imap
Folder [Gmail]/All Mail [acc: AllMail]:
 Creating new Local Status db for BoostProLocal:[Gmail].All Mail
 Syncing [Gmail]/All Mail: Gmail -> MappedIMAP
 Copy message 2 (1 of 222570) BoostProRemoteReadOnly:[Gmail]/All Mail -> BoostProLocal
 Copy message 3 (2 of 222570) BoostProRemoteReadOnly:[Gmail]/All Mail -> BoostProLocal
 Copy message 4 (3 of 222570) BoostProRemoteReadOnly:[Gmail]/All Mail -> BoostProLocal
 Copy message 5 (4 of 222570) BoostProRemoteReadOnly:[Gmail]/All Mail -> BoostProLocal
 Copy message 6 (5 of 222570) BoostProRemoteReadOnly:[Gmail]/All Mail -> BoostProLocal
 Copy message 7 (6 of 222570) BoostProRemoteReadOnly:[Gmail]/All Mail -> BoostProLocal
 Copy message 8 (7 of 222570) BoostProRemoteReadOnly:[Gmail]/All Mail -> BoostProLocal
 Copy message 9 (8 of 222570) BoostProRemoteReadOnly:[Gmail]/All Mail -> BoostProLocal
 Copy message 10 (9 of 222570) BoostProRemoteReadOnly:[Gmail]/All Mail -> BoostProLocal
 Copy message 11 (10 of 222570) BoostProRemoteReadOnly:[Gmail]/All Mail -> BoostProLocal
 Copy message 13 (11 of 222570) BoostProRemoteReadOnly:[Gmail]/All Mail -> BoostProLocal
 Copy message 14 (12 of 222570) BoostProRemoteReadOnly:[Gmail]/All Mail -> BoostProLocal
 Copy message 15 (13 of 222570) BoostProRemoteReadOnly:[Gmail]/All Mail -> BoostProLocal
 Copy message 16 (14 of 222570) BoostProRemoteReadOnly:[Gmail]/All Mail -> BoostProLocal
 Copy message 17 (15 of 222570) BoostProRemoteReadOnly:[Gmail]/All Mail -> BoostProLocal
 Copy message 18 (16 of 222570) BoostProRemoteReadOnly:[Gmail]/All Mail -> BoostProLocal
 Copy message 19 (17 of 222570) BoostProRemoteReadOnly:[Gmail]/All Mail -> BoostProLocal
 Copy message 20 (18 of 222570) BoostProRemoteReadOnly:[Gmail]/All Mail -> BoostProLocal
 Copy message 21 (19 of 222570) BoostProRemoteReadOnly:[Gmail]/All Mail -> BoostProLocal
 Copy message 22 (20 of 222570) BoostProRemoteReadOnly:[Gmail]/All Mail -> BoostProLocal
 Copy message 23 (21 of 222570) BoostProRemoteReadOnly:[Gmail]/All Mail -> BoostProLocal
 Copy message 24 (22 of 222570) BoostProRemoteReadOnly:[Gmail]/All Mail -> BoostProLocal
 Copy message 25 (23 of 222570) BoostProRemoteReadOnly:[Gmail]/All Mail -> BoostProLocal
 Copy message 26 (24 of 222570) BoostProRemoteReadOnly:[Gmail]/All Mail -> BoostProLocal
 Copy message 27 (25 of 222570) BoostProRemoteReadOnly:[Gmail]/All Mail -> BoostProLocal
Copy message from BoostProRemoteReadOnly:[Gmail]/All Mail:
 Server supports UIDPLUS but got no APPENDUID appending a message.
 ERROR: Backend could not find uid for message, returned 0
Thread 'Copy message from BoostProRemoteReadOnly:[Gmail]/All Mail' terminated with exception:
Traceback (most recent call last):
  File "/usr/local/stow/.virtualenvs/offlineimap-6.5.2.1/lib/python2.7/site-packages/offlineimap/threadutil.py", line 155, in run
    Thread.run(self)
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/threading.py", line 504, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/usr/local/stow/.virtualenvs/offlineimap-6.5.2.1/lib/python2.7/site-packages/offlineimap/folder/Base.py", line 300, in copymessageto
    new_uid = dstfolder.savemessage(uid, message, flags, rtime)
  File "/usr/local/stow/.virtualenvs/offlineimap-6.5.2.1/lib/python2.7/site-packages/offlineimap/folder/UIDMaps.py", line 195, in savemessage
    "%s" % newluid)
ValueError: Backend could not find uid for message, returned 0


Last 5 debug messages logged for Copy message from BoostProRemoteReadOnly:[Gmail]/All Mail prior to exception:
thread: Register new thread 'Copy message from BoostProRemoteReadOnly:[Gmail]/All Mail' (account 'AllMail')
imap: Returned object from fetching 25: 'Return-Path: <troy at resophonic.com>
X-Original-To: dave at boostpro.com
Delivered-To: dave at boostpro.com
Received: from flourine.resophonic.com (flourine.r...rectory when BOOST_BUILD_SLAVE is turned on.

-t

'
imap: savemessage: called
imap: savemessage: date: "26-Aug-2008 11:06:05 -0500", content: 'Return-Path: <troy at resophonic.com>
X-Original-To: dave at boostpro.com
Delivered-To: dave at boostpro.com
Received: from flourine.resophonic.com (flourin...ory when BOOST_BUILD_SLAVE is turned on.

-t

'
imap: savemessage: returning new UID 0
ERROR: Exceptions occurred during the run!
ERROR: Backend could not find uid for message, returned 0
imap(dave): Info: Connection closed in=188070 out=4726
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-- 
Dave Abrahams
BoostPro Computing
http://www.boostpro.com