Traceback (most recent call last):
  File "/usr/bin/software-center", line 143, in <module>
    app.run(args)
  File "/usr/share/software-center/softwarecenter/ui/gtk/app.py", line 1248, in run
    self.show_available_packages(args)
  File "/usr/share/software-center/softwarecenter/ui/gtk/app.py", line 1157, in show_available_packages
    app = DebFileApplication(request)
TypeError: this constructor takes no arguments