I create a my_package and compile it.
I want to delete a my_package.
and, I delete files about my_package.
However, When execute “colcon build”, warning message is out.
[0.360s] WARNING:colcon.colcon_ros.prefix_path.ament:The path ‘/home/user/ros2_ws/install/a_package’ in the environment variable AMENT_PREFIX_PATH
doesn’t exist
[0.361s] WARNING:colcon.colcon_ros.prefix_path.catkin:The path ‘/home/user/ros2_ws/install/a_package’ in the environment variable CMAKE_PREFIX_PAT
H doesn’t exist