D-BUS error: Method "AddNotify" with signature "s" on interface "org.gnome.GConf.Database" doesn't exist

[I'M YourOnly.One 🔏]

I lost the error data for the Source Center crash, one-time paste for some reason.

Here's the error data for the Update Manager crash on Lubuntu 11.10 64-bit

Distribution: Ubuntu 11.10 oneiric
Application: Ubuntu Tweak 0.5.14
Desktop: lxde

Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/ubuntutweak/mainwindow.py", line 502, in setup_notebook
    page = module()
  File "/usr/lib/python2.7/dist-packages/ubuntutweak/modules/updatemanager.py", line 48, in __init__
    key='/apps/update-notifier/auto_launch')
  File "/usr/lib/python2.7/dist-packages/ubuntutweak/ui/widgets.py", line 53, in __init__
    self.__setting = GconfSetting(key=key, default=default, type=bool)
  File "/usr/lib/python2.7/dist-packages/ubuntutweak/conf/gconfsetting.py", line 60, in __init__
    self.get_client().add_dir(self.get_dir(), gconf.CLIENT_PRELOAD_NONE)
GError: Configuration server couldn't be contacted: D-BUS error: Method "AddNotify" with signature "s" on interface "org.gnome.GConf.Database" doesn't exist