Django Channel Demo Error From its site

I am trying to start with channels but the demo in python shell is not working properly:https://channels.readthedocs.io/en/latest/tutorial/part_2.html#enable-a-channel-layer

Its is showing some thing like this :

(InteractiveConsole)

>>> import channels.layers
>>> channel_layer = channels.layers.get_channel_layer()
>>> from asgiref.sync import async_to_sync
>>> async_to_sync(channel_layer.send)('test_channel', {'type': 'hello'})
Segmentation fault (core dumped)

please help

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