Traceback (most recent call last):
  File "/usr/lib/unity-lens-photos/unity-lens-photos", line 159, in <module>
    daemon = Daemon()
  File "/usr/lib/unity-lens-photos/unity-lens-photos", line 91, in __init__
    from facebook_scope import Scope as facebook
  File "/usr/lib/unity-lens-photos/facebook_scope.py", line 31, in <module>
    from gi.repository import Signon
  File "/usr/lib/python3/dist-packages/gi/importer.py", line 76, in load_module
    dynamic_module._load()
  File "/usr/lib/python3/dist-packages/gi/module.py", line 244, in _load
    overrides_modules = __import__('gi.overrides', fromlist=[self._namespace])
  File "/usr/lib/python3/dist-packages/gi/overrides/Signon.py", line 24, in <module>
    AuthSession = override(AuthSession)
  File "/usr/lib/python3/dist-packages/gi/overrides/__init__.py", line 70, in override
    registry.register(type_)
  File "/usr/lib/python3/dist-packages/gi/overrides/__init__.py", line 44, in register
    self[override_class] = override_class
  File "/usr/lib/python3/dist-packages/gi/overrides/__init__.py", line 34, in __setitem__
    assert g_type != _gobject.TYPE_NONE
AssertionError