Group '' was not found, yet part of srdf

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Hello, I'm trying to use the move_base_to_manip package on my mobile manipulator. I am using ROS Melodic and installed the package via git clone. I changed the move group name to the relevant group name ur_arm (which is declared in the srdf) in the move_base_to_manip.cpp.

When I, as mentioned on the website, do rosrun move_base_to_manip provide_target and roslaunch move_base_to_manip move_base_to_manip.launch the client and service find each other but the following error occurs in the terminal of the roslaunch move_base_to_manip move_base_to_manip.launch:

[FATAL] [1588166074.398821886, 707.054000000]: Group '' was not found. terminate called after throwing an instance of 'std::runtime_error' what():  Group '' was not found.

move_base_to_manip.cpp:

# include "move_base_to_manip.h"

/////////////////
// The algorithm:
/////////////////

// Put the end-effector at the height & orientation of the desired pose.

// Calculate the X,Y vector from the ee's current pose to the desired pose.

// Plan a Cartesian move to the grasp pose. What % completes? If 100%, we're done!

// Based on the completed Cartesian %, how far along the (X,Y) vector must the base move?
// Move the base to that position.

// Should be able to reach it now. Run the program again to complete the motion or make minor
// corrections as needed.

///////////////////////////////////////////////////

int main(int argc, char **argv)
{
  ros::init(argc, argv, "move_base_to_manip");

  // Start an action server
  base_planner commander;

  // Wait for an action goal to trigger the CB
  ros::spin();

  return 0;
}


//////////////
// Constructor
//////////////
base_planner::base_planner():
    as_(nh_, "move_base_to_manip", boost::bind(&base_planner::do_motion_CB, this, _1), false)
{
  // Set node parameters, if they aren't defined in a launch file
  set_node_params();

  // Action server
  as_.start();

}


/////////////////////////////////////////////////////  
// Once a goal is received, start planning and moving
/////////////////////////////////////////////////////
void base_planner::do_motion_CB( const move_base_to_manip::desired_poseGoalConstPtr& goal )
{
  ROS_INFO("[move_base_to_manip] Received a new goal. Moving.");

  // Initialize MoveGroup for the arm
  std::string move_group_name;
  nh_.getParam("ur_arm", move_group_name);
  moveit::planning_interface::MoveGroupInterface move_group( move_group_name );

  // get the current EE pose
  geometry_msgs::PoseStamped start_pose = move_group.getCurrentPose();

  // make sure the goal is in the right frame
  std::string base_frame_name;
  nh_.getParam("base_link", base_frame_name);
  move_base_to_manip::desired_poseResult result;
  if (goal->desired_pose.header.frame_id != base_frame_name)
  {
    result.success = false;
    as_.setSucceeded( result );
    ROS_WARN_STREAM("The target pose should be given in " << base_frame_name);
    return;
  }

  // We don't want to move in (X,Y), initially
  geometry_msgs::PoseStamped desired_height_orient = goal->desired_pose;
  desired_height_orient.pose.position.x = start_pose.pose.position.x;
  desired_height_orient.pose.position.y = start_pose.pose.position.y;

  ///////////////////////////////////////////////////
  // Put the EE at the height & orientation we desire
  ///////////////////////////////////////////////////
  ROS_INFO_STREAM("[move_base_to_manip] Moving to the desired height and orientation.");
  move_group.setPoseTarget( desired_height_orient );

  // Get the orientation as RPY so we can manipulate it
  tf::Quaternion gripper_quat;
  tf::quaternionMsgToTF( desired_height_orient.pose.orientation, gripper_quat );
  double object_roll, object_pitch, object_yaw;
  tf::Matrix3x3(gripper_quat).getRPY(object_roll, object_pitch, object_yaw);

  moveit::planning_interface::MoveGroupInterface::Plan move_plan;

PLAN_AGAIN:
  bool ok_to_flip;
  nh_.getParam("ok_to_flip", ok_to_flip); 
  if ( !move_group.plan(move_plan) && ok_to_flip )  // If it fails, try spinning the gripper 180deg
  {
    geometry_msgs::Quaternion gripper_quat_msg = tf::createQuaternionMsgFromRollPitchYaw( 0., 0., object_yaw +3.14159);
    desired_height_orient.pose.orientation = gripper_quat_msg;
    move_group.setPoseTarget( desired_height_orient );
    if ( !move_group.plan(move_plan) ) // If it fails again, try spinning the gripper -180deg from the original attempt
    {  
      gripper_quat_msg = tf::createQuaternionMsgFromRollPitchYaw( 0., 0., object_yaw -3.14159 ...