frank@xps8900:~/Adafruit_Python_BluefruitLE/examples$ python list_uarts.py
Traceback (most recent call last):
  File "list_uarts.py", line 60, in <module>
    ble.run_mainloop_with(main)
  File "build/bdist.linux-x86_64/egg/Adafruit_BluefruitLE/bluez_dbus/provider.py", line 105, in run_mainloop_with
  File "build/bdist.linux-x86_64/egg/Adafruit_BluefruitLE/bluez_dbus/provider.py", line 120, in _user_thread_main
  File "list_uarts.py", line 22, in main
    ble.clear_cached_data()
  File "build/bdist.linux-x86_64/egg/Adafruit_BluefruitLE/bluez_dbus/provider.py", line 146, in clear_cached_data
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 70, in __call__
    return self._proxy_method(*args, **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 145, in __call__
    **keywords)
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in call_blocking
    message, timeout)
dbus.exceptions.DBusException: org.bluez.Error.NotReady: Resource Not Ready