i have a button to restart the same scene but it dont works (with images)

i have many many things but no one of them worked

i had created an empty gameobject and attached this script to it then put the gameobject into the button's ONCLICK and then choosen the public function of the script

then when i play the the game the button dont work i dont understand why

i have only one scene and when the players die the button be activated 'i have done this in onother script" i click the button to restart the scene...

this is he script:

using UnityEngine.SceneManagement; using UnityEngine;

public class RESTART : MonoBehaviour {

 public void restart()
 {
     //SceneManager.LoadScene (SceneManager.GetActiveScene ().name);

     //Scene loadedLevel = SceneManager.GetActiveScene ();
     //SceneManager.LoadScene (loadedLevel.buildIndex);


     SceneManager.LoadScene("GAME");


     //SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex);
     
 }

}