failed to run nao_behaviors (nao_driver/nao_behaviors.py)

[rqg0717]

Tried to run nao_behaviors node and got the following error:

Traceback (most recent call last):
File "/opt/openrobots/lib/nao_driver/nao_behaviors.py", line 139, in
node = NaoBehaviors()
File "/opt/openrobots/lib/nao_driver/nao_behaviors.py", line 85, in init
self.actionlibServer.start()
File "/opt/openrobots/lib/python2.7/site-packages/actionlib/simple_action_server.py", line 211, in start
self.action_server.start();
File "/opt/openrobots/lib/python2.7/site-packages/actionlib/action_server.py", line 134, in start
self.initialize();
File "/opt/openrobots/lib/python2.7/site-packages/actionlib/action_server.py", line 155, in initialize
search_status_frequency_name = rospy.search_param("actionlib_status_frequency")
File "/opt/openrobots/lib/python2.7/site-packages/rospy/client.py", line 509, in search_param
return param_server.search_param(param_name)
File "/opt/openrobots/lib/python2.7/site-packages/rospy/msproxy.py", line 162, in search_param
code, msg, val = self.target.searchParam(rospy.names.get_caller_id(), key)
File "/usr/lib/python2.7/xmlrpclib.py", line 1224, in _call
return self.__send(self.__name, args)
File "/usr/lib/python2.7/xmlrpclib.py", line 1578, in __request
verbose=self.__verbose
File "/usr/lib/python2.7/xmlrpclib.py", line 1264, in request
return self.single_request(host, handler, request_body, verbose)
File "/usr/lib/python2.7/xmlrpclib.py", line 1297, in single_request
return self.parse_response(response)
File "/usr/lib/python2.7/xmlrpclib.py", line 1473, in parse_response
return u.close()
File "/usr/lib/python2.7/xmlrpclib.py", line 793, in close
raise Fault(**self._stack[0])
xmlrpclib.Fault:

Please advise. Thanks a lot.