INFO    : GSettings missing key org.gnome.desktop.wm.preferences (key button-layout)
INFO    : GSettings missing key org.gnome.settings-daemon.plugins.power (key lid-close-suspend-with-external-monitor)
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)
CRITICAL: Could not find schema /usr/share/glib-2.0/schemas/org.gnome.shell.overrides.gschema.xml
Traceback (most recent call last):
  File "/usr/bin/gnome-tweak-tool", line 75, in <module>
    MainWindow()
  File "/usr/lib/python2.7/dist-packages/gtweak/mainwindow.py", line 41, in __init__
    model)
  File "/usr/lib/python2.7/dist-packages/gtweak/tweakview.py", line 58, in __init__
    self._model.load_tweaks()
  File "/usr/lib/python2.7/dist-packages/gtweak/tweakmodel.py", line 147, in load_tweaks
    mods = __import__("gtweak.tweaks", globals(), locals(), tweak_files, 0)
  File "/usr/lib/python2.7/dist-packages/gtweak/tweaks/tweak_shell.py", line 272, in <module>
    GSettingsSwitchTweak("org.gnome.shell.overrides", "workspaces-only-on-primary"),
  File "/usr/lib/python2.7/dist-packages/gtweak/widgets.py", line 145, in __init__
    _GSettingsTweak.__init__(self, schema_name, key_name, **options)
  File "/usr/lib/python2.7/dist-packages/gtweak/widgets.py", line 126, in __init__
    self.settings = GSettingsSetting(schema_name, **options)
  File "/usr/lib/python2.7/dist-packages/gtweak/gsettings.py", line 131, in __init__
    _SCHEMA_CACHE[schema_name] = _GSettingsSchema(schema_name, schema_dir=schema_dir, **options)
  File "/usr/lib/python2.7/dist-packages/gtweak/gsettings.py", line 43, in __init__
    assert(False)
AssertionError