name 'Node' is not defined

[ntukenmez3]

Hi all, when we launch the following example in the Webots-ros2 tutorial, we got the following error, could you help us to get rid of that problem, thanks.

The example link: https://docs.ros.org/en/humble/Tutorials/Advanced/Simulators/Webots/Setting-Up-Simulation-Webots-Advanced.html

ntukenmez3@ae-icps-407120:~/ros2_ws/src$ ros2 launch my_package robot_launch.py

[INFO] [launch]: All log files can be found below /home/ntukenmez3/.ros/log/2023-09-07-17-39-57-599365-ae-icps-407120-1653965
[INFO] [launch]: Default logging verbosity is set to INFO 
WARNING: No valid Webots directory specified in `ROS2_WEBOTS_HOME` and `WEBOTS_HOME`, fallback to default installation folder /usr/local/webots.
[ERROR] [launch]: Caught exception in launch (see debug for traceback): Caught exception when trying to load file of format [py]: name 'Node' is not defined