MoveIt! pick and place problem - "The trajectory to execute is empty" - "Initialization failed" [closed]

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Hello,

I am trying to get a simple pick and place program to work. I modified this file to work with my MoveIt! package. The resulting code is shown below. When I try to run this code I get the following error:

It seems the planning goes well, but the moment the plan is executed this error appears. Also, when I simulate in RVIZ the 'planning model' of the robot seems to be moving without any problems. The 'real robot model' though, is not moving whatsoever. Which seems to correspond pretty well with the error message.

I've been stuck on this error for almost the entire day and have no clue where it comes from. Does anyone have an idea on what could be the problem?

Thank you for your help!

The code:

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/* Author: Ioan Sucan */

#include <ros/ros.h>

// MoveIt!
#include <moveit/planning_scene_monitor/planning_scene_monitor.h>
#include <moveit/move_group_interface/move_group.h>
#include <shape_tools/solid_primitive_dims.h>
//#include <manipulation_msgs/Grasp.h>

static const std::string ROBOT_DESCRIPTION="robot_description";

void pick(moveit::planning_interface::MoveGroup &group)
{
  std::vector<moveit_msgs::Grasp> grasps;

  geometry_msgs::PoseStamped p;
  p.header.frame_id = "base_link";
  p.pose.position.x = 0.5;
  p.pose.position.y = -0.7;
  p.pose.position.z = 0.5;
  p.pose.orientation.x = 0;
  p.pose.orientation.y = 0;
  p.pose.orientation.z = 0;
  p.pose.orientation.w = 1;
  moveit_msgs::Grasp g;
  g.grasp_pose = p;

  g.pre_grasp_approach.direction.vector.x = 1.0;
  g.pre_grasp_approach.direction.header = p.header;
  g.pre_grasp_approach.min_distance  = 0.1;
  g.pre_grasp_approach.desired_distance = 0.2;

  g.post_grasp_retreat.direction.header = p.header;
  g.post_grasp_retreat.direction.vector.z = 1.0;
  g.post_grasp_retreat.min_distance = 0.1;
  g.post_grasp_retreat.desired_distance ...