Modifications for launching UR5e ros_control with new MoveIt! config

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I am using the MoveIt! Setup Assistant in ROS Kinetic to generate a new MoveIt! configuration with the goal of trying to continuously control a UR5e with a Robotiq 2f-140 gripper, but the configuration is not working as expected. After generating the configuration, I have modifed my_robot_moveit_config/config/controllers.yaml according to the instructions according to ros_control with the ur_modern_driver package and GripperCommand, but encounter the warning below before the spawner finshes and

[INFO] [1557268989.540753]: Controller Spawner: Waiting for service controller_manager/load_controller
[WARN] [1557262201.240509]: Controller Spawner couldn't find the expected controller_manager ROS interface.

My my_robot_moveit_config/launch/ros_controllers.launch file is the same as created by the Setup Assistant:

<?xml version="1.0"?>
<launch>

  <!-- Load joint controller configurations from YAML file to parameter server -->
  <rosparam file="$(find my_robot_moveit_config)/config/ros_controllers.yaml" command="load"/>

  <!-- Load the controllers -->
  <node name="controller_spawner" pkg="controller_manager" type="spawner" respawn="false"
    output="screen" ns="my_robot" args="pos_based_pos_traj_controller  joint_state_controller "/>

  <!-- Convert joint states to TF transforms for rviz, etc -->
  <node name="robot_state_publisher" pkg="robot_state_publisher" type="robot_state_publisher"
    respawn="false" output="screen">
    <remap from="/joint_states" to="my_robot/joint_states" />
  </node>

</launch>

I have also tried replacing config/ros_controllers.yaml with config/controllers.yaml according to the ur_modern_driver README.md, but it results in the same behavior.

Here is config/controllers.yaml for reference:

my_robot:
  # MoveIt-specific simulation settings
  moveit_sim_hw_interface:
    joint_model_group: controllers_initial_group_
    joint_model_group_pose: controllers_initial_pose_
  # Settings for ros_control control loop
  generic_hw_control_loop:
    loop_hz: 500
    cycle_time_error_threshold: 0.01
  # Settings for ros_control hardware interface
  hardware_interface:
    joints:
      - shoulder_pan_joint
      - shoulder_lift_joint
      - elbow_joint
      - wrist_1_joint
      - wrist_2_joint
      - wrist_3_joint
      - finger_joint
    sim_control_mode: 1  # 0: position, 1: velocity
  # Publish all joint states
  # Creates the /joint_states topic necessary in ROS
  joint_state_controller:
    type: joint_state_controller/JointStateController
    publish_rate: 500
  controller_list:
    - name: ""
      action_ns: gripper
      type: GripperCommand
      default: true
      joints:
        - finger_joint
    - name: /pos_based_pos_traj_controller
      action_ns: follow_joint_trajectory
      default: True
      type: FollowJointTrajectory
      joints:
        - shoulder_pan_joint
        - shoulder_lift_joint
        - elbow_joint
        - wrist_1_joint
        - wrist_2_joint
        - wrist_3_joint
  pos_based_pos_traj_controller:
    type: position_controllers/JointTrajectoryController
    joints:
      - shoulder_pan_joint
      - shoulder_lift_joint
      - elbow_joint
      - wrist_1_joint
      - wrist_2_joint
      - wrist_3_joint
    constraints:
      goal_time: 0.6
      stopped_velocity_tolerance: 0.05
      shoulder_pan_joint: {trajectory: 0.1, goal: 0.1}
      shoulder_lift_joint: {trajectory: 0.1, goal: 0.1}
      elbow_joint: {trajectory: 0.1, goal: 0.1}
      wrist_1_joint: {trajectory: 0.1, goal: 0.1}
      wrist_2_joint: {trajectory: 0.1, goal: 0.1}
      wrist_3_joint: {trajectory: 0.1, goal: 0.1}
    stop_trajectory_duration: 0.5
    state_publish_rate:  500
    action_monitor_rate: 10
    gains:
      shoulder_pan_joint:
        p: 100
        d: 1
        i: 1
        i_clamp: 1
      shoulder_lift_joint:
        p: 100
        d: 1
        i: 1
        i_clamp: 1
      elbow_joint:
        p: 100
        d: 1
        i: 1
        i_clamp: 1
      wrist_1_joint:
        p: 100
        d: 1
        i: 1
        i_clamp: 1
      wrist_2_joint:
        p: 100
        d: 1
        i: 1
        i_clamp: 1
      wrist_3_joint:
        p: 100
        d: 1
        i: 1
        i_clamp: 1

What am I doing wrong?