Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.7/screenlets/__init__.py", line 2074, in realize_event
    self.on_realize()
  File "/usr/share/screenlets/screenlets-pack-basic/Clock/ClockScreenlet.py", line 227, in on_realize
    self.refresh_buffers()
  File "/usr/share/screenlets/screenlets-pack-basic/Clock/ClockScreenlet.py", line 262, in refresh_buffers
    self.redraw_foreground()
  File "/usr/share/screenlets/screenlets-pack-basic/Clock/ClockScreenlet.py", line 275, in redraw_foreground
    self.theme.render(ctx_fore,'clock-face-shadow')
AttributeError: 'NoneType' object has no attribute 'render'