software-properties-gtk crashed with ValueError in run(): <aptsources.sourceslist.SourceEntry object at 0x9473ccc> is not in list

[Ngassam Nkwenga]

I wanted to edit a source entry and I notice that is not possible now. when trying to validate my modification software source crashes .

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: software-properties-gtk 0.81.9
ProcVersionSignature: Ubuntu 3.0.0-12.19-generic 3.0.4
Uname: Linux 3.0.0-12-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 1.23-0ubuntu2
Architecture: i386
Date: Thu Oct 6 15:54:37 2011
ExecutablePath: /usr/bin/software-properties-gtk
InterpreterPath: /usr/bin/python2.7
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/software-properties-gtk -n -t 0
ProcEnviron:
 LANG=en_US.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/software-properties-gtk', '-n', '-t', '0']
SourcePackage: software-properties
Title: software-properties-gtk crashed with ValueError in run(): <aptsources.sourceslist.SourceEntry object at 0x9473ccc> is not in list
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #829286, so 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.