Traceback (most recent call last):
  File "/usr/share/screenlets/screenlets-pack-basic/Clock/ClockScreenlet.py", line 497, in <module>
    screenlets.session.create_session(ClockScreenlet)
  File "/usr/lib/pymodules/python2.7/screenlets/session.py", line 474, in create_session
    session.start()
  File "/usr/lib/pymodules/python2.7/screenlets/session.py", line 239, in start
    if self.__load_instances():
  File "/usr/lib/pymodules/python2.7/screenlets/session.py", line 393, in __load_instances
    sl = self.create_instance(id=filename[:-4], enable_saving=False)
  File "/usr/lib/pymodules/python2.7/screenlets/session.py", line 145, in create_instance
    sl = self.screenlet(id=id, session=self, **keyword_args)
  File "/usr/share/screenlets/screenlets-pack-basic/Clock/ClockScreenlet.py", line 139, in __init__
    **keyword_args)
  File "/usr/lib/pymodules/python2.7/screenlets/__init__.py", line 797, in __init__
    self.load_buttons(None)
  File "/usr/lib/pymodules/python2.7/screenlets/__init__.py", line 1245, in load_buttons
    self.closeb = self.gtk_icon_theme.load_icon ("gtk-close", 16, 0)
GError: Icon 'gtk-close' not present in theme