Zombie Script Problem?

Check to see if your zombie's humanoid is actually named humanoid. I had a zombie scripted like this too and it is perfectly fine. Just make sure that the zombie's humanoid is named humanoid, not zombie. A player's weapon is usually set to damage a humanoid named humanoid, not a humanoid named zombie.

Hope this helped!

Change the script to this.

	local larm = script.Parent:FindFirstChild("Left Arm")
	local rarm = script.Parent:FindFirstChild("Right Arm")
	 
	function findNearestTorso(pos)
	    local list = game.Workspace:children()
	    local torso = nil
    local dist = 100
	    local temp = nil
	    local human = nil
	    local temp2 = nil
	    for x = 1, #list do
	        temp2 = list[x]
        if (temp2.className == "Model") and (temp2 ~= script.Parent) then
            temp = temp2:findFirstChild("Torso")
	            human = temp2:findFirstChild("Humanoid")
	            if (temp ~= nil) and (human ~= nil) and (human.Health > 0) then
	                if (temp.Position - pos).magnitude < dist then
	                    torso = temp
	                    dist = (temp.Position - pos).magnitude
	                end
	            end
	        end
	    end
	    return torso
	end
	 
	function Hit(hit)
	    local human = hit.Parent:FindFirstChild("Humanoid")
	    if human ~= nil then
	        human.Health =  human.Health -12
	    end
	end
	 
	larm.Touched:connect(Hit)
	rarm.Touched:connect(Hit)
	while true do
	    wait(0.1)
	    local target = findNearestTorso(script.Parent.Torso.Position)
    if target ~= nil then
	        script.Parent.Humanoid:MoveTo(target.Position, target)
	    end
	end