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Current /kobuki/laser/scan not ready yet

When using the ROS Development Studio and following the tutorial at , I can not get it to work. Running roslaunch turtle2_openai_ros_example start_training.launch only leads to the warning:

[ERROR] [1554815151.623766]: Current /kobuki/laser/scan not ready yet, retrying for getting laser_scan

The same happens when I try to run the link with the code generated in the tutorial, instead of trying to set it up myself.