Traceback (most recent call last):
  File "/usr/share/software-center/softwarecenter/ui/gtk/app.py", line 724, in on_menuitem_reinstall_purchases_activate
    self._create_scagent_if_needed()
  File "/usr/share/software-center/softwarecenter/ui/gtk/app.py", line 718, in _create_scagent_if_needed
    from backend.scagent import SoftwareCenterAgent
ImportError: No module named backend.scagent