I am using Ubuntu 16.04 Beta 2.
This is my simple package: https://github.com/arunavanag591/test_ros2

When I try this 
`ros2 topic pub /test_topic std_msgs/String "hello"`

It throws me this:

    Traceback (most recent call last):
      File "/home/artc/ros2_ws/install/bin/ros2", line 9, in <module>
        load_entry_point('ros2cli==0.0.0', 'console_scripts', 'ros2')()
      File "/home/artc/ros2_ws/install/lib/python3.5/site-packages/ros2cli/cli.py", line 64, in main
        rc = extension.main(parser=parser, args=args)
      File "/home/artc/ros2_ws/install/lib/python3.5/site-packages/ros2topic/command/topic.py", line 38, in main
        return extension.main(args=args)
      File "/home/artc/ros2_ws/install/lib/python3.5/site-packages/ros2topic/verb/pub.py", line 43, in main
        return main(args)
      File "/home/artc/ros2_ws/install/lib/python3.5/site-packages/ros2topic/verb/pub.py", line 47, in main
        return publisher(args.message_type, args.topic_name, args.values)
      File "/home/artc/ros2_ws/install/lib/python3.5/site-packages/ros2topic/verb/pub.py", line 78, in publisher
        set_msg_fields(msg, values_dictionary)
      File "/home/artc/ros2_ws/install/lib/python3.5/site-packages/ros2topic/verb/pub.py", line 92, in set_msg_fields
        for field_name, field_value in values.items():
    AttributeError: 'str' object has no attribute 'items'





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