The warning just means you didn't depress the red e-stop button on the side of the opener. You don't have to depress the e-stop regardless. Just acknowledge the warning and continue with the run. If something isn't right in your programming (door type ,multidrop, etc.), It will just say learn run aborted and you will be back to were you started so no harm no foul, usually haha. As previously mentioned it could be dol sensor. Easy to watch, it just blocks the sensor on full open so see if it moved. Good luck.