I got an error while launch moveit rviz :Action client not connected: position_trajectory_controller/follow_joint_trajectory

edit

straight dump of the error:

  Waiting for position_trajectory_controller/follow_joint_trajectory to come up
[ INFO] [1558437639.904264435]: Failed to call service get_planning_scene, have you launched move_group? at /tmp/binarydeb/ros-kinetic-moveit-ros-planning-0.9.15/planning_scene_monitor/src/planning_scene_monitor.cpp:498
[ INFO] [1558437640.034982681]: Constructing new MoveGroup connection for group 'manipulator' in namespace ''
[ WARN] [1558437643.144612377]: Waiting for position_trajectory_controller/follow_joint_trajectory to come up
[ERROR] [1558437649.144719813]: Action client not connected: position_trajectory_controller/follow_joint_trajectory

can anybody help me to solve it..