Unity Error CS0234: SceneMangement

I imported a new standard assets for my 2D Platformer but I got this error :

Assets/Standard Assets/2D/Scripts/Restarter.cs(3,19): error CS0234: The type or namespace name SceneManagement' does not exist in the namespace UnityEngine’. Are you missing an assembly reference?

The Codes :

using System;
using UnityEngine;
using UnityEngine.SceneManagement;

namespace UnityStandardAssets._2D
{
public class Restarter : MonoBehaviour
{
private void OnTriggerEnter2D(Collider2D other)
{
if (other.tag == “Player”)
{
SceneManager.LoadScene(SceneManager.GetSceneAt(0).path);
}
}
}
}

Asset Link : Unity Asset Store - The Best Assets for Game Making

Current Unity Version : 5.0.0f4

SceneManagement is only available in Unity 5.3 and above. In version 5.0.0f4 there is no SceneManagement, you have to use Application.LoadLevel (obsolete in current version).

thank u @mikelo