Traceback (most recent call last):
  File "/usr/share/screenlets/Calendar/CalendarScreenlet.py", line 272, in <module>
    screenlets.session.create_session(CalendarScreenlet)
  File "/usr/lib/pymodules/python2.6/screenlets/session.py", line 472, in create_session
    session.start()
  File "/usr/lib/pymodules/python2.6/screenlets/session.py", line 237, in start
    if self.__load_instances():
  File "/usr/lib/pymodules/python2.6/screenlets/session.py", line 391, in __load_instances
    sl = self.create_instance(id=filename[:-4], enable_saving=False)
  File "/usr/lib/pymodules/python2.6/screenlets/session.py", line 143, in create_instance
    sl = self.screenlet(id=id, session=self, **keyword_args)
  File "/usr/share/screenlets/Calendar/CalendarScreenlet.py", line 46, in __init__
    screenlets.Screenlet.__init__(self, uses_theme=True,width=130,height=141, **keyword_args)
  File "/usr/lib/pymodules/python2.6/screenlets/__init__.py", line 808, in __init__
    if str(sensors.sys_get_window_manager()).lower() == 'kwin':
  File "/usr/lib/pymodules/python2.6/screenlets/sensors.py", line 340, in sys_get_window_manager
    name = win.property_get("_NET_WM_NAME")[2]
AttributeError: 'str' object has no attribute 'property_get'