bug in turpial-git

Traceback (most recent call last):
  File "/usr/bin/turpial", line 9, in <module>
    load_entry_point('turpial==1.5.0-b7', 'console_scripts', 'turpial')()
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 305, in load_entry_point
    return get_distribution(dist).load_entry_point(group, name)
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 2244, in load_entry_point
    return ep.load()
  File "/usr/lib/python2.7/site-packages/pkg_resources.py", line 1954, in load
    entry = __import__(self.module_name, globals(),globals(), ['__name__'])
  File "/usr/lib/python2.7/site-packages/turpial/main.py", line 20, in <module>
    from turpial.ui.cmd.main import Main as _CMD
  File "/usr/lib/python2.7/site-packages/turpial/ui/cmd/main.py", line 15, in <module>
    from turpial.sound import Sound
  File "/usr/lib/python2.7/site-packages/turpial/sound.py", line 9, in <module>
    import ao
ImportError: No module named ao