Pathfinding not working

Help and Feedback Scripting Support
#1

I tried to make a NPC follow a player, but I am kind of confused about how Pathfinding works.
The output says:
Workspace.Dummy.Walk:58: attempt to index nil with ‘Position’ - Server - Walk:58

local larm = script.Parent:FindFirstChild("Left Arm")
local rarm = script.Parent:FindFirstChild("Right Arm")
local Z = script.Parent:FindFirstChild("Humanoid")
local debounce = false
local e = false
local damage = 15
local pathfindingService = game:GetService("PathfindingService")




Anim = Z:LoadAnimation(script.Parent.Animation)

function findNearestTorso(pos)
	local list = game.Workspace:children()
	local torso = nil
	local dist = 50
	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
		if debounce then return end
		debounce = true

	
		human:TakeDamage(damage)
		
		wait(1)
		debounce = false
	end
end

larm.Touched:connect(Hit)
rarm.Touched:connect(Hit)

while true do
	wait(0.1)
	local target = findNearestTorso(script.Parent.Torso.Position)
	local path = pathfindingService:CreatePath()
	path:ComputeAsync(script.Parent.Torso.Position, target.Position) -- error
	local waypoints = path:GetWaypoints()

	if target ~= nil then
		for i, waypoint in pairs(waypoints) do
			Z:MoveTo(waypoint.Position)
			Z.MoveToFinished:Wait(1)
		end
		script.Parent.Humanoid:MoveTo(waypoints.Position)
	
		if e == false then
			Anim:Play()
			e = true
			end
	end
end

Is there any way of that I can fix this?
(If I did anything wrong with this post please tell me)

#2

Your function findNearestTorso(pos) has returned nil and now your script is trying to access nil.Position in the line that’s thrown the error.