ROS2-Eloquent-Binary demo run error:"Failed to load entry point **" on Mac (10.14)

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Hello everyone,

I met a problem when I followed the tutorial about ROS2 installation on Mac. It shows me the following error when I just type "ros2" in the terminal:

Failed to load entry point 'launch': No module named 'rclpy._rclpy'

Failed to load entry point 'info': No module named 'rclpy._rclpy'

Failed to load entry point 'type': No module named 'rclpy._rclpy'

......

I used command "chsh -s /bin/bash" to use bash command, so I source both "setup.bash" and "local_setup.bash" instead of *zsh

Thank you for the support, and very appreciated!

Best Regards