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I have edited turtle_tf_listener.py, and added tf.ExtrapolationException to the list of exceptions caught on line 58, so that my line 58 now reads:

except (tf.LookupException, tf.ConnectivityException, tf.ExtrapolationException):

This basically just catches the exception and moves on. Not sure if this is the recommended solution, but at least I can move on with the tutorial now :)

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