"get ubuntu addons" ended gnome-app-install

Binary package hint: gnome-app-install

When I'm trying to open "Get Ubuntu Addons", a window appears which says, that the Programm "Gnome-App-Install" has unexpected been ended.

ProblemType: Crash
Architecture: amd64
Date: Mon Feb 11 00:16:39 2008
DistroRelease: Ubuntu 8.04
ExecutablePath: /usr/bin/gnome-app-install
InterpreterPath: /usr/bin/python2.5
NonfreeKernelModules: fglrx
Package: gnome-app-install 0.5.2-0ubuntu1
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/gnome-app-install --xul-extensions=firefox
ProcCwd: /home/sabine
ProcEnviron:
 LANGUAGE=de_DE:de:en_GB:en
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=de_DE.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/gnome-app-install', '--xul-extensions=firefox']
SourcePackage: gnome-app-install
Title: gnome-app-install crashed with AttributeError in modifyUserInterface()
Uname: Linux HansPeter 2.6.24-7-generic #1 SMP Thu Feb 7 00:56:31 UTC 2008 x86_64 GNU/Linux
UserGroups: adm admin audio cdrom dialout dip floppy lpadmin netdev plugdev powerdev scanner video