[Cause]
The device is configured for stud welding, and $spotconfig.$std_rec_ok = FALSE. The robot cannot resume work unless a recovery method is selected from the recovery menu. This protects the stud welding gun from stud-blockage errors. If $spotconfig.$std_rec_ok is set to TRUE, work can resume without selecting a recovery method.
[Countermeasure]
Select the recovery method from the recovery menu and send a start signal to the robot.