Q)  The CNC controller is showing STOP warning in the controller AUTO mode.

A) Please check if the EMG switch is kept pressed. If EMG switch is pressed this could happen.
If the EMG switch is pressed when power ON and released when power OFF, After that if power ON the machine this error will come. To resolve the issue Power off the machine then press the EMG switch and then power ON the machine and go to AUTO then release the EMG switch to solve the issue.