[Sidebar] Sidebar screenlet fails to start

[Steve Benchik]

I am on Xubuntu 12.04 using Xfce 4.10, Python 2.7, and Screenlets 0.1.7. Whenever I try to launch the sidebar screenlet from the screenlet manager, nothing happens. I tried to run it in a terminal and this was my result: (I also tried purging and reintalling, but to no avail.)

family@compaq:~$ python -u /usr/share/screenlets/Sidebar/SidebarScreenlet.py
CachingBackend: Loading instances from cache
Found a running session of Sidebar, adding new instance by service.
Error in screenlets.services.get_service_by_name: org.freedesktop.DBus.Error.ServiceUnknown: The name org.screenlets.Sidebar was not provided by any .service files
Screenlet has already been added to /tmp/screenlets/screenlets.family.running
Loading instances in: /home/family/.config/screenlets/Sidebar/default/
No instance(s) found in session-path, creating new one.
Traceback (most recent call last):
  File "/usr/share/screenlets/Sidebar/SidebarScreenlet.py", line 756, in <module>
    screenlets.session.create_session(SidebarScreenlet)
  File "/usr/lib/pymodules/python2.7/screenlets/session.py", line 487, in create_session
    session.start()
  File "/usr/lib/pymodules/python2.7/screenlets/session.py", line 256, in start
    sl = self.screenlet(session=self, id=self.__get_next_id(), show_window=False)
  File "/usr/share/screenlets/Sidebar/SidebarScreenlet.py", line 116, in __init__
    self.free_screen_space()
  File "/usr/share/screenlets/Sidebar/SidebarScreenlet.py", line 477, in free_screen_space
    self.window.window.property_change('_NET_WM_STRUT_PARTIAL', 'CARDINAL', 32, gtk.gdk.PROP_MODE_REPLACE, [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0])
AttributeError: 'NoneType' object has no attribute 'property_change'