I can not visual the data

[xianggu666]

I use ubuntu16.04,and ros kinetic, When I follow the document--<<ethzasl_sensor_fusionTutorialsgetting_started >>,i can not visual the data by $rosrun ssf_core plot_relevant,it says
,TopicCompleter.update_topics(): could not get message class for topic type "sensor_fusion_comm/ExtEkf" on topic "/ssf_core/correction"
TopicCompleter.update_topics(): could not get message class for topic type "sensor_fusion_comm/DoubleArrayStamped" on topic "/ssf_core/state_out"
TopicCompleter.update_topics(): could not get message class for topic type "sensor_fusion_comm/ExtState" on topic "/ssf_core/ext_state"

Do you have any ideas??