The pathfinding script for my zombie Isn't working, why?

So I recently learned how to use pathfinding service! anyway the problem Is where the NPC Isn't following the player

script:

local NPC = script.Parent
local PathfindingService = game:GetService('PathfindingService')
local Players = game:GetService('Players')
local Player = Players:GetPlayerFromCharacter()

local path = PathfindingService:CreatePath()
path:ComputeAsync(NPC.Torso.Position, Player.Character.PrimaryPart.Position)

if path.Status == Enum.PathStatus.Success then
	local Positions = path:GetWaypoints()
	
	for i,v in pairs(Positions) do
		local ball = Instance.new("Part", workspace)
		
		ball.Position = v.Position
		ball.Anchored = true
		ball.CanCollide = false
		ball.Size = Vector3.new(4,4,4)
		ball.Transparency = 0.5
		
		NPC.Humanoid:MoveTo(v.Position)
	end
end

I believe the issue is with line 4, in order to find the local player in a server script, use the "PlayerAdded" function.

Replace this with line 4:

local player

game.Players.PlayerAdded:Connect(function(client)
	player = client
end)

repeat wait() until player ~= nil

I'm sorry about the delay!

P.S: The 'GetPlayerFromCharacter' function is to find the player if you know the character. e.g:

script.Parent.Touched:Connect(function(hit)
	if hit.Parent:FindFirstChild("Humanoid")	then
		local player = game.Players:GetPlayerFromCharacter(hit.Parent)

		print(player) -- Prints the player's name
		print(player.Parent -- prints "Players"
	end
end)