Reinforcement Learning Penguins Course: SİMPLE IDE PROBLEM

İN UNİTY EDİTOR I GET THİS ERROR:

Assets\Penguin\Scripts\PenguinArea.cs(3,7): error CS0246: The type or namespace name ‘MLAgent’ could not be found (are you missing a using directive or an assembly reference?)

İN MY PenguinArea.cs FİLE ERROR LOOKİNG LİKE THİS
using MLAgent;

  1. ERROR:
    Assets\Penguin\Scripts\PenguinAgent.cs(4,29): error CS0246: The type or namespace name ‘Agent’ could not be found (are you missing a using directive or an assembly reference?)

İN MY PenguinArea.cs FİLE ERROR LOOKİNG LİKE THİS
using UnityEngine;
using MLAgent;

public class PenguinAgent : Agent
{

Change it to
using Unity.MLAgent;

thanks for reply