problem in rosmsg [closed]

edit

When I input:$ rosmsg show beginner_tutorials/Num the result is: Unable to load msg [beginner_tutorials/Num]: Cannot locate message [Num]: unknown package [beginner_tutorials] on search path [{'rosconsole': ['/opt/ros/kinetic/share/rosconsole/msg'], 'catkin': ['/opt/ros/kinetic/share/catkin/msg'], 'qt_dotgraph': ['/opt/ros/kinetic/share/qt_dotgraph/msg'], 'image_view': ['/opt/ros/kinetic/share/image_view/msg'], 'urdf': ['/opt/ros/kinetic/share/urdf/msg'], 'rosgraph': ['/opt/ros/kinetic/share/rosgraph/msg'], 'resource_retriever': ['/opt/ros/kinetic/share/resource_retriever/msg'], 'nodelet_topic_tools': ['/opt/ros/kinetic/share/nodelet_topic_tools/msg'], 'rqt_graph': ['/opt/ros/kinetic/share/rqt_graph/msg'], 'nodelet_tutorial_math': ['/opt/ros/kinetic/share/nodelet_tutorial_math/msg'], 'qt_gui': ['/opt/ros/kinetic/share/qt_gui/msg'], 'filters': ['/opt/ros/kinetic/share/filters/msg'], 'smclib': ['/opt/ros/kinetic/share/smclib/msg'], 'roslib': ['/opt/ros/kinetic/share/roslib/msg'], 'geneus': ['/opt/ros/kinetic/share/geneus/msg'], 'roscpp_serialization': ['/opt/ros/kinetic/share/roscpp_serialization/msg'], 'rqt_rviz': ['/opt/ros/kinetic/share/rqt_rviz/msg'], 'rosbuild': ['/opt/ros/kinetic/share/rosbuild/msg'], 'rosclean': ['/opt/ros/kinetic/share/rosclean/msg'], 'tf': ['/opt/ros/kinetic/share/tf/msg'], 'rqt_publisher': ['/opt/ros/kinetic/share/rqt_publisher/msg'], 'roswtf': ['/opt/ros/kinetic/share/roswtf/msg'], 'geometric_shapes': ['/opt/ros/kinetic/share/geometric_shapes/msg'], 'smach_ros': ['/opt/ros/kinetic/share/smach_ros/msg'], 'rqt_web': ['/opt/ros/kinetic/share/rqt_web/msg'], 'shape_msgs': ['/opt/ros/kinetic/share/shape_msgs/msg'], 'interactive_markers': ['/opt/ros/kinetic/share/interactive_markers/msg'], 'diagnostic_aggregator': ['/opt/ros/kinetic/share/diagnostic_aggregator/msg'], 'robot_state_publisher': ['/opt/ros/kinetic/share/robot_state_publisher/msg'], 'smach_msgs': ['/opt/ros/kinetic/share/smach_msgs/msg'], 'rqt_py_console': ['/opt/ros/kinetic/share/rqt_py_console/msg'], 'rqt_topic': ['/opt/ros/kinetic/share/rqt_topic/msg'], 'laser_filters': ['/opt/ros/kinetic/share/laser_filters/msg'], 'rqt_action': ['/opt/ros/kinetic/share/rqt_action/msg'], 'rqt_top': ['/opt/ros/kinetic/share/rqt_top/msg'], 'diagnostic_msgs': ['/opt/ros/kinetic/share/diagnostic_msgs/msg'], 'rosgraph_msgs': ['/opt/ros/kinetic/share/rosgraph_msgs/msg'], 'rosboost_cfg': ['/opt/ros/kinetic/share/rosboost_cfg/msg'], 'genmsg': ['/opt/ros/kinetic/share/genmsg/msg'], 'xacro': ['/opt/ros/kinetic/share/xacro/msg'], 'turtle_tf2': ['/opt/ros/kinetic/share/turtle_tf2/msg'], 'rqt_robot_dashboard': ['/opt/ros/kinetic/share/rqt_robot_dashboard/msg'], 'pluginlib': ['/opt/ros/kinetic/share/pluginlib/msg'], 'xmlrpcpp': ['/opt/ros/kinetic/share/xmlrpcpp/msg'], 'gl_dependency': ['/opt/ros/kinetic/share/gl_dependency/msg'], 'rqt_service_caller': ['/opt/ros/kinetic/share/rqt_service_caller/msg'], 'rqt_msg': ['/opt/ros/kinetic/share/rqt_msg/msg'], 'rosmaster': ['/opt/ros/kinetic/share/rosmaster/msg'], 'rosnode': ['/opt/ros/kinetic/share/rosnode/msg'], 'rqt_pose_view': ['/opt/ros/kinetic/share/rqt_pose_view/msg'], 'bond': ['/opt/ros/kinetic/share/bond/msg'], 'self_test': ['/opt/ros/kinetic/share/self_test/msg'], 'rospack': ['/opt/ros/kinetic/share/rospack/msg'], 'actionlib_msgs': ['/opt/ros/kinetic/share/actionlib_msgs/msg'], 'image_rotate': ['/opt/ros/kinetic/share/image_rotate/msg'], 'webkit_dependency': ['/opt/ros/kinetic/share/webkit_dependency/msg'], 'rqt_console': ['/opt/ros/kinetic/share/rqt_console/msg'], 'joint_state_publisher': ['/opt/ros/kinetic/share/joint_state_publisher/msg'], 'depth_image_proc': ['/opt/ros/kinetic/share/depth_image_proc/msg'], 'tf2_msgs': ['/opt/ros/kinetic/share/tf2_msgs/msg'], 'python_qt_binding': ['/opt/ros/kinetic/share/python_qt_binding/msg'], 'laser_geometry': ['/opt/ros/kinetic/share/laser_geometry/msg'], 'rviz': ['/opt/ros/kinetic/share/rviz/msg'], 'gencpp': ['/opt/ros/kinetic/share/gencpp/msg'], 'rqt_gui_cpp': ['/opt/ros/kinetic/share/rqt_gui_cpp/msg'], 'rqt_bag': ['/opt/ros/kinetic/share/rqt_bag/msg'], 'rqt_gui': ['/opt/ros/kinetic/share/rqt_gui/msg'], 'qt_gui_py_common': ['/opt/ros/kinetic/share ... (more)