org.freedesktop.DBus.Python.AttributeError: Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/dbus/service.py", line 707, in _message_cb
    retval = candidate_method(self, *args, **keywords)
  File "/usr/share/usb-creator/usb-creator-helper", line 252, in Format
    partition = table.call_create_partition_sync(0, size, '0x0c', '', no_options, None)
AttributeError: 'NoneType' object has no attribute 'call_create_partition_sync'