PiTiVi won't run.

Binary package hint: pitivi

I am using Gusty. When I try to run pitivi it gives me this error:
Traceback (most recent call last):
  File "/usr/local/bin/pitivi", line 113, in <module>
    _run_pitivi()
  File "/usr/local/bin/pitivi", line 102, in _run_pitivi
    import pitivi.pitivi as pitivi
  File "/usr/local/lib/pitivi/python/pitivi/pitivi.py", line 29, in <module>
    from ui import mainwindow
  File "/usr/local/lib/pitivi/python/pitivi/ui/mainwindow.py", line 49, in <module>
    from pluginmanagerdialog import PluginManagerDialog
  File "/usr/local/lib/pitivi/python/pitivi/ui/pluginmanagerdialog.py", line 29, in <module>
    import pitivi.plugincore as plugincore
  File "/usr/local/lib/pitivi/python/pitivi/plugincore.py", line 22, in <module>
    from zope.interface import Interface, Attribute
ImportError: No module named zope.interface
I think some files are missing but am not sure how to fix it.
Goo