15331 Touch sensor retract LS is not On

hi, i have a problem with a Okuma p100, the error is 15331.
con you help me to solve the problem.
how i fix the error

There is normally a proximity switch that detects when the arm is fully up. It may may require a little adjustment. There should be an indicator light on the prox showing when it is retracted.

thanks for your support okumawiz