Traceback (most recent call last):
  File "/usr/sbin/computer-janitor", line 35, in <module>
    main()
  File "/usr/share/computerjanitor/computerjanitorapp/cli/main.py", line 310, in main
    options.arguments.func(options.arguments)
  File "/usr/share/computerjanitor/computerjanitorapp/cli/main.py", line 291, in clean
    timeout=3600)
  File "/usr/lib/pymodules/python2.6/dbus/proxies.py", line 132, in __call__
    **keywords)
  File "/usr/lib/pymodules/python2.6/dbus/connection.py", line 556, in call_async
    message.append(signature=signature, *args)
TypeError: Don't know how which D-Bus type to use to encode type "set"