I just installed a program called Accerciser, but when I run it through command line, it throws error:

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Traceback (most recent call last):
File "/usr/local/bin/accerciser", line 76, in <module>
accerciser.main()
File "/usr/local/lib/python2.7/site-packages/accerciser/__init__.py", line 35, in main
main = Main()
File "/usr/local/lib/python2.7/site-packages/accerciser/accerciser.py", line 62, in __init__
self.window = AccerciserMainWindow(self.node)
File "/usr/local/lib/python2.7/site-packages/accerciser/main_window.py", line 51, in __init__
self._populateUI(node)
File "/usr/local/lib/python2.7/site-packages/accerciser/main_window.py", line 87, in _populateUI
sw.set_shadow_type(gtk.ShadowType.IN_)
AttributeError: type object 'GtkShadowType' has no attribute 'IN_'
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how can I deal with this error? thanks!