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I know, this is actually quite old by now...

I stumbled upon the same problem recently. If you do not build the rosbridge_suite package that you clone, i guess you include the old rosbride_protocol.py (installed one) which simply does not have the parameter keyword in it's __init__ function. So you can fix it by checking out the current groovy-devel/hydro-devel branch into your workspace and build it with catkin_make (even though it is mainly python).

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