XBee Network Error

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I am working with the XBee Network Example on the wiki (using ROS Hydro on Ubuntu 12.04 with Series 1 XBees) but I can't get further than setting up the XBees. Has anyone successfully got the example working? I get this error after entering the command

rosrun rosserial_xbee xbee_network.py /dev/ttyS0 1

RosSerial Xbee Network

Contacting Xbees : ['\x00\x01']

Exception in thread Thread-6:

Traceback (most recent call last):

File "/usr/lib/python2.7/threading.py", line 551, in __bootstrap_inner self.run()

File "/usr/lib/python2.7/threading.py", line 504, in run self.__target(self.__args, *self.__kwargs)

File "/opt/ros/hydro/lib/python2.7/dist-packages/rosserial_python/SerialClient.py", line 426, in run if self.port.inWaiting() < 1:

AttributeError: FakeSerial instance has no attribute 'inWaiting'