Scene changing with virtual button

Hi everyone....my problem is I am unable to change the scene with virtual button. Here is the script which I have attached with the virtual button. Can anyone help me out?

using System.Collections; using System.Collections.Generic; using UnityEngine; using Vuforia; using UnityEngine.SceneManagement;

public class vbButton_cube : MonoBehaviour, IVirtualButtonEventHandler { public GameObject[] myButtons; public GameObject cube;

 public GameObject VirtualButton;

 
 
 
 // Start is called before the first frame update
 void Start()
 {

/ for (int i = 0; i < myButtons.Length; i++) { myButtons[i].GetComponent().RegisterEventHandler(this); } / }

 // Update is called once per frame
 void Update()
 {
     
 }

 public void OnButtonPressed(VirtualButtonBehaviour vb)
 {
     Debug.Log(vb.name);
     //cube.SetActive(true);
     SceneManager.LoadScene("MAIN COURSE");
     
     
 }
   
 
     
 
 
 public void OnButtonReleased(VirtualButtonBehaviour vb)
 {
     cube.SetActive(true);
 }

},Hi everyone...I am unable to change the scene by using the virtual button. Here is the script Which I have attached with the virtual button. Can anyone help me out?

using System.Collections; using System.Collections.Generic; using UnityEngine; using Vuforia; using UnityEngine.SceneManagement;

public class vbButton_cube : MonoBehaviour, IVirtualButtonEventHandler { public GameObject[] myButtons; public GameObject cube;

 public GameObject VirtualButton;

 
 
 
 // Start is called before the first frame update
 void Start()
 {

/ for (int i = 0; i < myButtons.Length; i++) { myButtons[i].GetComponent().RegisterEventHandler(this); } / }

 // Update is called once per frame
 void Update()
 {
     
 }

 public void OnButtonPressed(VirtualButtonBehaviour vb)
 {
     Debug.Log(vb.name);
     //cube.SetActive(true);
     SceneManager.LoadScene("MAIN COURSE");
     
     
 }
   
 
     
 
 
 public void OnButtonReleased(VirtualButtonBehaviour vb)
 {
     cube.SetActive(true);
 }

}