Need help figuring out how to make pathfinding auto-adjust

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1

Hello!

I need help figuring out how I can make this script so it makes the NPC always walk to the nearest player even if they move, and if they do move then it should find the new nearest or recalculate the path the second they move. Help would be appreciated, here is my script, when I tried to do a loop, it just said HumanoidRootPart couldn’t be found.

local PathfindingService = game:GetService("PathfindingService")
local runService = game:GetService("RunService")

local human = script.Parent:WaitForChild("Humanoid")
local torso = script.Parent:WaitForChild("Torso")

local magnitude = math.huge
local closestvector = 0

local function returner()
	
for i,v in pairs(game.Players:GetPlayers()) do
    if magnitude > (v.Character.HumanoidRootPart.Position - torso.Position).Magnitude and (v.Character.HumanoidRootPart.Position - torso.Position).Magnitude <= 50 then
        magnitude = (v.Character.HumanoidRootPart.Position - torso.Position).Magnitude
        closestvector = v.Character.HumanoidRootPart.Position
    end
  end 
   return closestvector
end

local closestvector = returner()

runService.Heartbeat:Connect(function()
	local path = PathfindingService:CreatePath()
	path:ComputeAsync(torso.Position, Vector3.new(closestvector))
	local waypoints = path:GetWaypoints()

		for i, waypoint in pairs(waypoints) do
		if waypoint.Action == Enum.PathWaypointAction.Jump then
		human:ChangeState(Enum.HumanoidStateType.Jumping)
		end
		human:MoveTo(waypoint.Position)
		human.MoveToFinished:Wait()
	end
	closestvector = returner()
	human:MoveTo(Vector3.new(closestvector))
end)