RuntimeError: To make asynchronous calls, receive signals or export objects, D-Bus connections must be attached to a main loop by passing mainloop=... to the constructor or calling dbus.set_default_main_loop(...)
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Traceback (most recent call last):

  File "/usr/bin/quodlibet", line 15, in <module>
    sys.exit(main())

  File "/usr/lib/python3.6/site-packages/quodlibet/main.py", line 168, in main
    DBusHandler(player, library)

  File "/usr/lib/python3.6/site-packages/quodlibet/qltk/dbus_.py", line 29, in __init__
    super(DBusHandler, self).__init__(name, path)

  File "/usr/lib/python3.6/site-packages/dbus/service.py", line 485, in __init__
    self.add_to_connection(conn, object_path)

  File "/usr/lib/python3.6/site-packages/dbus/service.py", line 576, in add_to_connection
    self._fallback)

RuntimeError: To make asynchronous calls, receive signals or export objects, D-Bus connections must be attached to a main loop by passing mainloop=... to the constructor or calling dbus.set_default_main_loop(...)