my attacking verb has an error on it.

here's the verb

obj/Skills/Attack
icon = 'HUDPanel.dmi'
icon_state = "Punch"
Click()
set category = null
var/DAMAGE = usr.PSTR
for(var/mob/M in oview(1))
if(M.NPC == "false")
usr << "You attacked [M] for [DAMAGE] damage!"
M << "[M] attacked you for [DAMAGE] damage!"
M.PL -= DAMAGE
M.DEATHCHECK()
else
usr << "You can't attack a Non-Player Character!"

i made it an obj so that its clickable to attack.
the ingame error messege is this below

runtime error: type mismatch
proc name: Click (/obj/Skills/Attack/Click)
Dark Legend attacked you for 2 damage!

Dark Legend is me and when someone attack me, it says that i attacked myself.