Connection of robot and computer XMLRPCLIB Error

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Hi there, i want to connect our robot to a computer to send all messages to him. I set ROS_MASTER_URI as described in the ROS Network Setup and it seems to be correct. If i change something, i get the error "Can not communicate with master". So i think the connection settings are fine. But if i execute rostopic list on the robots computer i get the following error:

  Traceback (most recent call last):
  File "/opt/ros/kinetic/bin/rostopic", line 35, in <module>
    rostopic.rostopicmain()
  File "/opt/ros/kinetic/lib/python2.7/dist-packages/rostopic/__init__.py", line 2099, in rostopicmain
    _rostopic_cmd_list(argv)
  File "/opt/ros/kinetic/lib/python2.7/dist-packages/rostopic/__init__.py", line 2039, in _rostopic_cmd_list
    exitval = _rostopic_list(topic, verbose=options.verbose, subscribers_only=options.subscribers, publishers_only=options.publishers, group_by_host=options.hostname) or 0
  File "/opt/ros/kinetic/lib/python2.7/dist-packages/rostopic/__init__.py", line 1205, in _rostopic_list
    state = master.getSystemState()
  File "/opt/ros/kinetic/lib/python2.7/dist-packages/rosgraph/masterapi.py", line 481, in getSystemState
    return self._succeed(self.handle.getSystemState(self.caller_id))
  File "/usr/lib/python2.7/xmlrpclib.py", line 1243, in __call__
    return self.__send(self.__name, args)
  File "/usr/lib/python2.7/xmlrpclib.py", line 1602, in __request
    verbose=self.__verbose
  File "/usr/lib/python2.7/xmlrpclib.py", line 1283, in request
    return self.single_request(host, handler, request_body, verbose)
  File "/usr/lib/python2.7/xmlrpclib.py", line 1316, in single_request
    return self.parse_response(response)
  File "/usr/lib/python2.7/xmlrpclib.py", line 1493, in parse_response
    return u.close()
  File "/usr/lib/python2.7/xmlrpclib.py", line 800, in close
    raise Fault(**self._stack[0])
xmlrpclib.Fault: <Fault 1: '<type \'exceptions.Exception\'>:method "getSystemState" is not supported'>

Do you think my approach of sending all messages to a control computer is wrong or do you have any thought about that error? Thanks for your help