Hi @Maythah. I added that warning because some users were confused about why their training had ended before their curriculum was complete, and wanted to know what they could do about it.
If your training runs for more than NoProgressIterationLimit (NPIL) iterations (state-action exchanges with your simulators) without producing a new high water mark for the policy, training stops. If you have one or more lessons in your curriculum that were not completed when the NPIL is hit, the message you copied will be emitted. It outlines the two main parameters you can control in order to calibrate when a lesson is deemed complete, and thus when the policy is ready to move on to the next lesson in the curriculum.
Does that answer your question?