No schema known for `/desktop/gnome/shell/windows/theme'
No schema known for `/desktop/gnome/shell/windows/theme'
No schema known for `/apps/metacity/general/action_double_click_titlebar'
No schema known for `/apps/metacity/general/action_double_click_titlebar'
No schema known for `/apps/metacity/general/action_middle_click_titlebar'
No schema known for `/apps/metacity/general/action_middle_click_titlebar'
No schema known for `/apps/metacity/general/action_right_click_titlebar'
No schema known for `/apps/metacity/general/action_right_click_titlebar'
No schema known for `/apps/metacity/general/focus_mode'
No schema known for `/apps/metacity/general/focus_mode'

(gnome-tweak-tool:11295): GLib-GIO-CRITICAL **: Settings schema 'org.gnome.shell' is not installed

WARNING : Error detecting shell
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/gtweak/tweaks/tweak_shell_extensions.py", line 145, in __init__
    shell = GnomeShellFactory().get_shell()
  File "/usr/lib/python2.7/site-packages/gtweak/utils.py", line 38, in getinstance
    instances[cls] = cls()
  File "/usr/lib/python2.7/site-packages/gtweak/gshellwrapper.py", line 122, in __init__
    settings = GSettingsSetting("org.gnome.shell")
  File "/usr/lib/python2.7/site-packages/gtweak/gsettings.py", line 66, in __init__
    _SCHEMA_CACHE[schema_name] = _GSettingsSchema(schema_name, **options)
  File "/usr/lib/python2.7/site-packages/gtweak/gsettings.py", line 34, in __init__
    assert(os.path.exists(schema_path))
AssertionError
Segmentation fault