gtk-builder-convert Error

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http://askubuntu.com – I am doing the tutorial in the link http://www.micahcarrick.com/gtk-glade-tutorial-part-1.html When I run the gtk-builder-convert tutorial.glade tutorial.xml I get the following error Traceback (most recent call last): File "/usr/bin/gtk-builder-convert", line 799, in <module> sys.exit(main(sys.argv)) File "/usr/bin/gtk-builder-convert", line 787, in main conv.parse_file(input_filename) File "/usr/bin/gtk-builder-convert", line 162, in parse_file self._parse() File "/usr/bin/gtk-builder-convert", line 234, in _parse assert glade_iface, ("Badly formed (HowTos)