backend_helper.py crashed with TransactionFailed in _run(): <unprintable TransactionFailed object>

It's crashed when I try to add some other repository.

ProblemType: Crash
DistroRelease: Ubuntu 13.04
Package: update-notifier-common 0.126
ProcVersionSignature: Ubuntu 3.8.0-0.3-generic 3.8.0-rc3
Uname: Linux 3.8.0-0-generic x86_64
ApportVersion: 2.8-0ubuntu1
Architecture: amd64
Date: Mon Jan 14 13:33:21 2013
ExecutablePath: /usr/lib/update-notifier/backend_helper.py
InstallationDate: Installed on 2012-12-28 (16 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
InterpreterPath: /usr/bin/python2.7
MarkForUpload: True
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/lib/update-notifier/backend_helper.py install_all_updates
PythonArgs: ['/usr/lib/update-notifier/backend_helper.py', 'install_all_updates']
SourcePackage: update-notifier
Title: backend_helper.py crashed with TransactionFailed in _run(): <unprintable TransactionFailed object>
UpgradeStatus: Upgraded to raring on 2013-01-09 (4 days ago)
UserGroups: adm cdrom davfs2 dip fuse lpadmin plugdev sambashare sudo