Crash on startup

On Slackware64 14.1, I get the following when I try to start udiskie:
    Traceback (most recent call last):
      File "/usr/bin/udiskie", line 9, in <module>
        load_entry_point('udiskie==1.0.2', 'console_scripts', 'udiskie')()
      File "/usr/lib64/python2.7/site-packages/udiskie/cli.py", line 203, in main
        return cls(argv).run()
      File "/usr/lib64/python2.7/site-packages/udiskie/cli.py", line 177, in
    __init__
        self._init(config, options)
      File "/usr/lib64/python2.7/site-packages/udiskie/cli.py", line 306, in _init
        daemon = get_backend('Daemon', options['udisks_version'])
      File "/usr/lib64/python2.7/site-packages/udiskie/cli.py", line 50, in
    get_backend
        return udisks1()
      File "/usr/lib64/python2.7/site-packages/udiskie/cli.py", line 43, in
    udisks1
        return getattr(udiskie.udisks1, clsname)()
      File "/usr/lib64/python2.7/site-packages/udiskie/udisks1.py", line 522, in
    __init__
        proxy = proxy or self.connect_service()
      File "/usr/lib64/python2.7/site-packages/udiskie/dbus.py", line 298, in
    connect_service
        interface_name=cls.Interface))
      File "/usr/lib64/python2.7/site-packages/gi/types.py", line 137, in
    constructor
        return info.invoke(cls, *args, **kwargs)
    TypeError: new_for_bus_sync() takes exactly 7 non-keyword arguments (2 given)

I've tried installing the SlackBuilds.org package (v. 1.0.2), and from git (via pip, udiskie v. 1.0.2 and 1.0.3), with the same result.