node crashes with "ros does not seem to be running"

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I have create a node, but each time I try and start it using a .launch file that just launches the node, I get:

process[simon_says_main_M_node-1]: started with pid [11354]
terminate called after throwing an instance of 'std::runtime_error'
  what():  ROS does not seem to be running
[simon_says_main_M_node-1] process has died [pid 11354, exit code -6, cmd /home/elsa/bax_ws/devel/lib/simon_says_main/simon_says_main_M_node __name:=simon_says_main_M_node __log:=/home/elsa/.ros/log/bed59e4c-873f-11ea-bd6a-305a3a7c519b/simon_says_main_M_node-1.log].
log file: /home/elsa/.ros/log/bed59e4c-873f-11ea-bd6a-305a3a7c519b/simon_says_main_M_node-1*.log

The log file does not exist. Using rosrun to launch the node gives the same result. The node does run on another computer, and both have the same setup of packages and so on as far as I can tell.

using rosrun results in:

[baxter - http://localhost:11311] elsa@Inanna:~/bax_ws$ rosrun simon_says_main simon_says_main_M_node 
terminate called after throwing an instance of 'std::runtime_error'
  what():  ROS does not seem to be running
Aborted (core dumped)

The code for the node is:

#include <pluginlib/class_loader.h>
#include <ros/ros.h>

#include <moveit/move_group_interface/move_group_interface.h>
#include <moveit/planning_scene_interface/planning_scene_interface.h>

#include <moveit_msgs/DisplayRobotState.h>
#include <moveit_msgs/DisplayTrajectory.h>

#include <moveit_msgs/AttachedCollisionObject.h>
#include <moveit_msgs/CollisionObject.h>

#include <moveit_visual_tools/moveit_visual_tools.h>


#include <boost/scoped_ptr.hpp>


/*
 To Run:
 1) start baxter
 2) rosrun baxter_tools enable_robot.py -e
 3) rosrun baxter_interface joint_trajectory_action_server.py
 4) roslaunch baxter_moveit_config demo_baxter.launch right_electric_gripper:=true left_electric_gripper:=true
 5) rosrun simon_says_main simon_says_main_M_node

 #get the current end effector coordinates
$ rostopic echo /robot/limb/right/endpoint_state 
*/

static const std::string PLANNING_GROUP_L = "left_arm";
static const std::string PLANNING_GROUP_R = "right_arm";

moveit::planning_interface::MoveGroupInterface move_group_L(PLANNING_GROUP_L);
moveit::planning_interface::MoveGroupInterface move_group_R(PLANNING_GROUP_R);

void dab()
  {
    //plan right arm
    geometry_msgs::Pose rp;
    rp.orientation.w = 0.67;
    rp.position.x = 0.357;
    rp.position.y = -0.08;
    rp.position.z = 0.39;
    move_group_R.setPoseTarget(rp);

    //plan left arm
    geometry_msgs::Pose lp;
    lp.orientation.w = 0.73;
    lp.position.x = 0.26;
    lp.position.y = 1.18;
    lp.position.z = 1.08;
    move_group_L.setPoseTarget(lp);

    moveit::planning_interface::MoveGroupInterface::Plan my_plan_R;
    moveit::planning_interface::MoveGroupInterface::Plan my_plan_L;

    bool success_R = (move_group_R.plan(my_plan_R) == moveit::planning_interface::MoveItErrorCode::SUCCESS);
    bool success_L = (move_group_L.plan(my_plan_L) == moveit::planning_interface::MoveItErrorCode::SUCCESS);

    ROS_INFO_NAMED("tutorial", "Visualizing dab - right arm (pose goal) %s", success_R ? "" : "FAILED");
    ROS_INFO_NAMED("tutorial", "Visualizing dab - left arm (pose goal) %s", success_L ? "" : "FAILED");

    move_group_L.move();
    move_group_R.move();

  /*
  DAB - RIGHT
    pose: 
      position: 
        x: 0.357449700371
        y: -0.0845383821871
        z: 0.398438102254
      orientation: 
        x: -0.347113539773
        y: -0.354022093046
        z: -0.548629443089
        w: 0.673191118715
  DAB - LEFT
      frame_id: ''
    pose: 
      position: 
        x: 0.265252415343
        y: 1.18807756952
        z: 1.08236724242
      orientation: 
        x: -0.260426879784
        y: 0.376068085189
        z: 0.494750557147
        w: 0.738899534301
  */
  }

int main(int argc, char** argv)
{
  ros::init(argc, argv, "move_group_interface_tutorial");
  ros::NodeHandle node_handle;
  ros::AsyncSpinner spinner(1);
  spinner.start();

  printf("Hi!\n");

  moveit::planning_interface::PlanningSceneInterface planning_scene_interface;

  //iffy, don't need
  //move_group.getCurrentState()->getJointModelGroup(PLANNING_GROUP);

  // Visualization: The package MoveItVisualTools provides many capabilities for visualizing objects, robots, and trajectories in RViz as well as debugging tools such as step-by-step introspection of a script.
  namespace rvt = rviz_visual_tools ...