Garry's Mod Sit Anywhere script problem

So I implanted the "sit anywhere script" in my server, i know there is a command to make that player can get damage when seated but it doesn't work for me, I can't seem to figure out why, I have done some research but I found nothing so far.I need help.(I have also try the "damage player in seat" addon)

thx for helping!

Is sitting script have that command one??? O_O