I want to make some modifications to the nav2_bringup package. Therefore, I just copied the nav2_bringup package put it in the workspace and ran the Turtlebot 3 simulator. The following error occurred. Without copies, no errors, all work fine.
[ERROR] [launch]: Caught exception in launch (see debug for traceback): cannot import name 'PushROSNamespace' from 'launch_ros.actions' (/opt/ros/humble/lib/python3.10/site- packages/launch_ros/actions/__init__.py)