Ubuntu tweak crashes on loading

Ubuntu Tweak need to turn off.
If you'd like to help us fix the problem, please chooses report to file a new bug report. Make sure to include the error message below :

Traceback (most recent call last):
  File "/usr/bin/ubuntu-tweak", line 76, in <module>
    launcher = TweakLauncher()
  File "/usr/bin/ubuntu-tweak", line 42, in __init__
    from ubuntutweak.mainwindow import MainWindow
  File "/usr/lib/pymodules/python2.6/ubuntutweak/mainwindow.py", line 138, in <module>
    MLOADER = ModuleLoader(modules.__path__[0])
  File "/usr/lib/pymodules/python2.6/ubuntutweak/modules/__init__.py", line 27, in __init__
    package = __import__('.'.join([__name__, module]), fromlist=['modules'])
  File "/usr/lib/pymodules/python2.6/ubuntutweak/modules/sourcecenter.py", line 44, in <module>
    from appcenter import AppView, CategoryView, AppParser
  File "/usr/lib/pymodules/python2.6/ubuntutweak/modules/appcenter.py", line 42, in <module>
    UPDATE_SETTING = BoolSetting('/apps/ubuntu-tweak/appcenter_update')
  File "/usr/lib/pymodules/python2.6/ubuntutweak/common/settings.py", line 88, in __init__
    super(BoolSetting, self).__init__(key, default)
  File "/usr/lib/pymodules/python2.6/ubuntutweak/common/settings.py", line 54, in __init__
    self.__client.add_dir(self.dir, gconf.CLIENT_PRELOAD_NONE)
GError: Le contact du serveur de configuration a échoué ; causes possibles : vous n'avez pas activé le réseau TCP/IP pour ORBit ou des verrous NFS non valides existent suite à un blocage du système. Voir http://projects.gnome.org/gconf/ pour plus d'informations. (Détails - 1: Erreur lors du ping du serveur : IDL:omg.org/CORBA/COMM_FAILURE:1.0)

Ubuntu Tweak 0.5 runned successfuly the first time and then it's crashing on start up.