Traceback (most recent call last):
  File "/usr/bin/displayconfig-gtk", line 75, in <module>
    app = DisplayConfig(options)
  File "/usr/lib/python2.5/site-packages/displayconfiggtk/DisplayConfig.py", line 75, in __init__
    icon_theme.append_search_path(os.path.join(self.options.datadir,
AttributeError: 'NoneType' object has no attribute 'append_search_path'