Traceback (most recent call last):
  File "/usr/share/cinnamon-screensaver/cinnamon-screensaver-main.py", line 17, in <module>
    from service import ScreensaverService
  File "/usr/share/cinnamon-screensaver/service.py", line 9, in <module>
    from manager import ScreensaverManager
  File "/usr/share/cinnamon-screensaver/manager.py", line 10, in <module>
    from stage import Stage
  File "/usr/share/cinnamon-screensaver/stage.py", line 8, in <module>
    import singletons
  File "/usr/share/cinnamon-screensaver/singletons.py", line 46, in <module>
    gi.require_version('XApp', '1.0')
  File "/usr/lib64/python3.4/site-packages/gi/__init__.py", line 102, in require_version
    raise ValueError('Namespace %s not available' % namespace)
ValueError: Namespace XApp not available