Moveit tutorial cartesian path error, missing valid timestamp data?

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Hello,

I am following tutorial for Cartesian path using move_group c++ interface. But I am getting error when I send this trajectory to motoman robot.

[ERROR] [1556871367.163994139]: Validation failed: Missing valid timestamp data for trajectory pt 1
[ERROR] [1556871371.219235895]: Controller is taking too long to execute trajectory (the expected upper bound for the trajectory execution was 4.056057 seconds). Stopping trajectory

source code I am executing is,

      static const std::string PLANNING_GROUP = "arm";

   // The :move_group_interface:`MoveGroup` class can be easily
   // setup using just the name of the planning group you would like to control and plan for.
      moveit::planning_interface::MoveGroupInterface move_group(PLANNING_GROUP);

   // We will use the :planning_scene_interface:`PlanningSceneInterface`
   // class to add and remove collision objects in our "virtual world" scene
      moveit::planning_interface::PlanningSceneInterface planning_scene_interface;

   // Raw pointers are frequently used to refer to the planning group for improved performance.
      const robot_state::JointModelGroup* joint_model_group = move_group.getCurrentState()->getJointModelGroup(PLANNING_GROUP);
      geometry_msgs::Pose target_pose2 = move_group.getCurrentPose().pose;

      std::vector<geometry_msgs::Pose> waypoints;
      waypoints.push_back(target_pose2);
      //geometry_msgs::Pose target_pose3 = target_pose2;
      target_pose2.position.z -= 0.4;
      waypoints.push_back(target_pose2);

      target_pose2.position.x += 0.4;
      waypoints.push_back(target_pose2);

      move_group.setMaxVelocityScalingFactor(0.1);


      moveit_msgs::RobotTrajectory trajectory;
      const double jump_thresold = 0.0;
      const double eef_step = 0.01;
      move_group.computeCartesianPath(waypoints, eef_step, jump_thresold, trajectory);
      moveit::planning_interface::MoveGroupInterface::Plan my_plan1;
      my_plan1.trajectory_ = trajectory;
      move_group.execute(my_plan1);

How can I solve this?

thanks.

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[ERROR] [1557146297.748611305] [/motion_streaming_interface] [ros.motoman_driver]: Validation failed: Missing valid timestamp data for trajectory pt 1
[ERROR] [1557146299.550803668] [/move_group] [ros.moveit_ros_planning.trajectory_execution_manager]: Controller is taking too long to execute trajectory (the expected upper bound for the trajectory execution was 1.804171 seconds). Stopping trajectory.