ros2 run lane_following collect Why there is all NONE?

[hanyh1191]

Why there is all NONE?
selfubuntu:~/ros2_dashing/install/rclpy/lib/python3.6/site-packages/rclpy$ ros2 run lane_following collect
[INFO] [collect]: Starting Collect node...
Directory is ready: /home/hanyh/lgsvl/AD_stack_project/ros2_src/install/lane_following/lib/python3.6/site-packages/train/data
Directory is ready: /home/hanyh/lgsvl/AD_stack_project/ros2_src/install/lane_following/lib/python3.6/site-packages/train/data/img
[INFO] [collect]: Center camera topic: None
[INFO] [collect]: Left camera topic: None
[INFO] [collect]: Right camera topic: None
[INFO] [collect]: Canbus topic: None
[INFO] [collect]: Up and running...