update-manager crashed with AttributeError in initCache(): 'MessageDialog' object has no attribute 'vbox'

[Xenon360]

when i started update-manager -> crash

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: update-manager 1:0.152 [modified: usr/share/pyshared/UpdateManager/UpdateManager.py]
ProcVersionSignature: Ubuntu 3.0-3.4-generic 3.0.0-rc5
Uname: Linux 3.0-3-generic i686
Architecture: i386
Date: Tue Jul 12 08:56:34 2011
ExecutablePath: /usr/bin/update-manager
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha i386 (20110619)
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python2.7 /usr/bin/update-manager
ProcEnviron:
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/update-manager']
SourcePackage: update-manager
Title: update-manager crashed with AttributeError in initCache(): 'MessageDialog' object has no attribute 'vbox'
UpgradeStatus: Upgraded to oneiric on 2011-07-05 (6 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[RedSingularity (redsingularity)]

Since there is no private info in this report, I am marking it public.
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[Jean-Baptiste Lallement (jibel)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 810615, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.