Traceback (most recent call last):
  File "/usr/bin/glade2script", line 51, in <module>
    gi.require_version('AppIndicator3', '0.1')
  File "/usr/lib/python2.7/dist-packages/gi/__init__.py", line 118, in require_version
    raise ValueError('Namespace %s not available' % namespace)
ValueError: Namespace AppIndicator3 not available