Spectators blocking arrows

[Uzumaki]

Version 1.8.8

i tried this but it gives an error

my code

function sg_setspec(p: player): 
    hide {_p} from all players
    stop

 

[LimeGlass]

The players must be hidden from the arrow. There is no way to do this without MundoSk packets or using another plugin on Spigot that does this already.