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|690x243](upload://xone0Pzr7xPst1rGB2GO1lyYgkz.png) 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%202|690x379](upload://jGFgITOUM2qqcZgSQ6Gjr4XhoMm.png)![05%20PM|690x346](upload://uqH9Q00hykL40A9kLBhC2pU2jmP.jpg) Is there any means to fix the problem? Thanks Anis ROS Course for Beginners https://www.udemy.com/ros-essentials/?couponCode=ROSDISCOURSE1 --- [Visit Topic](https://discourse.ros.org/t/ros2-topic-and-ros2-node-command-problem-in-mac/5423/1) or reply to this email to respond. If you do not want to receive messages from ros-users please use the unsubscribe link below. If you use the one above, you will stop all of ros-users from receiving updates. ______________________________________________________________________________ ros-users mailing list ros-users@lists.ros.org http://lists.ros.org/mailman/listinfo/ros-users Unsubscribe: