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Ros2 topic and ros2 node command problem in MAC

Hi

I installed ROS2 on MAC and I run talker/listener application and both worked fine, but I found this warning (although it worked fine).

Aniss-MacBook-Pro-3:~ akoubaa$ ros2 run demo_nodes_cpp listener
Failed to load entry point ‘launch’: No module named ‘rclpy._rclpy’
Failed to load entry point ‘echo’: No module named ‘rclpy._rclpy’
Here is a screenshot
21%20PM

Then, I tried the commands
ros2 node list
and
ros2 topic list

and here there was serious problem as shown in the following two pictures
21%20PM%20205%20PM

Is there any means to fix the problem?

Thanks
Anis

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