Problems installing Hydro on Pi3 (yaml.constructor)

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Hi,

I'm following the step-by-step instruction: http://wiki.ros.org/ROSberryPi/Settin...

Step:

$ rosinstall_generator ros_comm --rosdistro hydro --deps --wet-only > hydro-ros_comm-wet.rosinstall

returns error:

 File "/home/pi/.local/lib/python2.7/site-packages/yaml/constructor.py", line 452, in construct_undefined
    node.start_mark)
yaml.constructor.ConstructorError: could not determine a constructor for the tag 'tag:yaml.org,2002:python/str'
  in "<string>", line 5773, column 28:
        </package>\n", ar_sys: !!python/str "<?xml version=\"1. ..

Anyone has an idea how to fix that?

Thanks Rabiato