how to use "deepracer_inferfaces_pkg"

I want to use matlab to learn deepracer.

If you proceed with the ros2 topic list in the deepracer,

/camera_pkg/display_mjpeg /camera_pkg/video_mjpeg /ctrl_pkg/raw_pwm /ctrl_pkg/servo_msg /deepracer_navigation_pkg/auto_drive /deepracer_systems_pkg/network_connection_status /deepracer_systems_pkg/software_update_pct /inference_pkg/rl_results /parameter_events /rosout /rplidar_ros/scan /sensor_fusion_pkg/overlay_msg /sensor_fusion_pkg/sensor_msg /usb_monitor_pkg/usb_file_system_notification /webserver_pkg/calibration_drive /webserver_pkg/manual_drive

The above is output, but in practice, it cannot be used except for display_mjpeg, overlay_msg, /rplidar_ros/scan.

When I looked up the reason,

ros2 topic echo /camera_pkg/video_mjpeg Traceback (most recent call last): File "/opt/ros/foxy/bin/ros2", line 11, in <module> load_entry_point('ros2cli==0.9.8', 'console_scripts', 'ros2')() File "/opt/ros/foxy/lib/python3.8/site-packages/ros2cli/cli.py", line 67, in main rc = extension.main(parser=parser, args=args) File "/opt/ros/foxy/lib/python3.8/site-packages/ros2topic/command/topic.py", line 41, in main return extension.main(args=args) File "/opt/ros/foxy/lib/python3.8/site-packages/ros2topic/verb/echo.py", line 81, in main return main(args) File "/opt/ros/foxy/lib/python3.8/site-packages/ros2topic/verb/echo.py", line 95, in main message_type = get_msg_class(node, args.topic_name, include_hidden_topics=True) File "/opt/ros/foxy/lib/python3.8/site-packages/ros2topic/api/init.py", line 88, in get_msg_class msg_class = _get_msg_class(node, topic, include_hidden_topics) File "/opt/ros/foxy/lib/python3.8/site-packages/ros2topic/api/init.py", line 133, in _get_msg_class return get_message(message_type) File "/opt/ros/foxy/lib/python3.8/site-packages/rosidl_runtime_py/utilities.py", line 28, in get_message interface = import_message_from_namespaced_type(get_message_namespaced_type(identifier)) File "/opt/ros/foxy/lib/python3.8/site-packages/rosidl_runtime_py/import_message.py", line 30, in import_message_from_namespaced_type module = importlib.import_module( File "/usr/lib/python3.8/importlib/init.py", line 127, in import_module return _bootstrap._gcd_import(name[level:], package, level) File "<frozen importlib._bootstrap>", line 1014, in _gcd_import File "<frozen importlib._bootstrap>", line 991, in _find_and_load File "<frozen importlib._bootstrap>", line 961, in _find_and_load_unlocked File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed File "<frozen importlib._bootstrap>", line 1014, in _gcd_import File "<frozen importlib._bootstrap>", line 991, in _find_and_load File "<frozen importlib._bootstrap>", line 973, in _find_and_load_unlocked ModuleNotFoundError: No module named 'deepracer_interfaces_pkg'

As above, it is said that the depth_interfaces_pkg cannot be found.

However, I completed the build after installation as shown below. (https://github.com/aws-deepracer/aws-deepracer-interfaces-pkg)

I wait for an answer to what I should do to use the deepacer-interfaces-pkg in the deepracer. Please tell me how to solve this problem.