Dear Maintainer,

When i run gnome-tweak-tool, no window is opened and i get this message:

phil@debian:~$ gnome-tweak-tool
INFO    : GSettings missing key org.gnome.settings-daemon.plugins.power (key lid-close-battery-action)
INFO    : GSettings missing key org.gnome.settings-daemon.plugins.power (key lid-close-ac-action)
INFO    : GSettings missing key org.gnome.settings-daemon.plugins.power (key lid-close-suspend-with-external-monitor)
INFO    : GSettings missing key org.gnome.nautilus.desktop (key computer-icon-visible)
WARNING : Error loading desktopfile: /home/phil/.config/autostart/dropbox.desktop
WARNING : Error loading desktopfile: /home/phil/.config/autostart/xfce4-settings-helper-autostart.desktop
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/gtweak/app.py", line 39, in do_activate
    self.win = Window(self, model)
  File "/usr/lib/python2.7/dist-packages/gtweak/tweakview.py", line 54, in __init__
    self._model.load_tweaks(self)
  File "/usr/lib/python2.7/dist-packages/gtweak/tweakmodel.py", line 125, in load_tweaks
    mods = __import__("gtweak.tweaks", globals(), locals(), tweak_files, 0)
  File "/usr/lib/python2.7/dist-packages/gtweak/tweaks/tweak_group_xkb.py", line 138, in <module>
    TypingTweakGroup(),
  File "/usr/lib/python2.7/dist-packages/gtweak/tweaks/tweak_group_xkb.py", line 127, in __init__
    obj = _XkbOption(opt, self._kbdsettings, self._xkb_info)
  File "/usr/lib/python2.7/dist-packages/gtweak/tweaks/tweak_group_xkb.py", line 68, in __init__
    self.reload()
  File "/usr/lib/python2.7/dist-packages/gtweak/tweaks/tweak_group_xkb.py", line 78, in reload
    self._update_combo()
  File "/usr/lib/python2.7/dist-packages/gtweak/tweaks/tweak_group_xkb.py", line 84, in _update_combo
    self._combo.disconnect(self._combo_changed_handler_id)
  File "/usr/lib/python2.7/dist-packages/gi/overrides/GObject.py", line 429, in wrapper
    return func(_get_instance_for_signal(obj), *args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/gi/types.py", line 113, in function
    return info.invoke(*args, **kwargs)
TypeError: argument instance: Expected GObject.Object, but got PyCObject
INFO    : e.g.o no updates for window_buttons@biox.github.com (shell version 3.8.4 extension version 10.0)

and the program hangs. I have to kill it.