How use the function Application.LoadLevelAsync(level);

Hello, I'm French and I speak a little enclish (I use Google traduction).

I try use the function Application.LoadLevelAsync, but the loading my scene does not exceed 90%.

Can you help? Thanks

This is my class (C#) :

 using System;
 using System.Collections;
 using System.Diagnostics;
 using UnityEngine;
 using UnityEngine.UI;
 public class Loading : MonoBehaviour
 {
     public GameObject _Loading;
     private Image _backgroundImage;
     private Text _Text;
     private Text _OmbreText;
     private Image _Chargement;
     private float _currentAlpha = 0.0f;
     private GameObject _currentPanel;
     private String _type;
     private int _Term = 0;
 
     private void Awake()
     {
         DontDestroyOnLoad(gameObject);
         Global.loading = this;
     }
 
 
     public void StartShowPanel(String type)
     {
         _type = type;
 
         StartCoroutine("ShowPanel");
     }
 
     private IEnumerator ShowPanel(){
 
         
         InstantiateLoadPanel ();
 
         while (_currentAlpha < 1) {
                         yield return new WaitForSeconds (0.035f);
             _currentAlpha += 0.25f; 
             _Chargement.color = new Color (_Chargement.color.r, _Chargement.color.g, _Chargement.color.b, _currentAlpha);
             _backgroundImage.color = new Color (_backgroundImage.color.r, _backgroundImage.color.g, _backgroundImage.color.b, _currentAlpha);
             _Text.color = new Color (_Text.color.r, _Text.color.g, _Text.color.b, _currentAlpha);
             _OmbreText.color = new Color (_OmbreText.color.r, _OmbreText.color.g, _OmbreText.color.b, _currentAlpha);
                 }
         DoAction ();
 
         }
 
     private IEnumerator HidePanel(){
         
         _Term = 1;
         while (_currentAlpha > 0) {
             yield return new WaitForSeconds (0.035f);
             _currentAlpha -= 0.25f; 
             
             _Chargement.color = new Color (_Chargement.color.r, _Chargement.color.g, _Chargement.color.b, _currentAlpha);
             _backgroundImage.color = new Color (_backgroundImage.color.r, _backgroundImage.color.g, _backgroundImage.color.b, _currentAlpha);
             _Text.color = new Color (_Text.color.r, _Text.color.g, _Text.color.b, _currentAlpha);
             _OmbreText.color = new Color (_OmbreText.color.r, _OmbreText.color.g, _OmbreText.color.b, _currentAlpha);
         }
         _Term = 2;
         Destroy (_currentPanel);
 
     }
 
     private void InstantiateLoadPanel()
     {
         _currentPanel = Instantiate<GameObject>(_Loading);
         if (_currentPanel == null)
         {
             return;
         }
         
         _Chargement = _currentPanel.transform.FindChild("Chargement").FindChild("Chargement_Image").GetComponent<Image>();
         _backgroundImage = _currentPanel.transform.FindChild("Image").GetComponent<Image>();
         _Text = _currentPanel.transform.FindChild("Text").GetComponent<Text>();
         _OmbreText = _currentPanel.transform.FindChild("OmbreText").GetComponent<Text>();
         DontDestroyOnLoad(_currentPanel);
     }
     private void DoAction()
     {
 
         StartCoroutine("LevelLoaderProcess");
     }
 
     public float pourcent = 0.0f;
     public bool doneLoadingScene = false;
 
     IEnumerator LevelLoaderProcess() {
         AsyncOperation status = Application.LoadLevelAsync(_type);
         status.allowSceneActivation = false;
 
 
 
         
         while (!status.isDone && !doneLoadingScene) {
             yield return new WaitForSeconds(0.35f);
             pourcent = status.progress * 100f;
             _Chargement.transform.Rotate (0, 0, 0.25f);
 
             
             if(status != null && !doneLoadingScene) 
             {  
                 print("Scene Load Progress: " + status.progress * 100f); 
                 if(status.isDone) 
                 {  
                     doneLoadingScene = true; 
                     print("SCENE DONE LOADING!"); 
                 }  
             }  
 
 
         }
         status.allowSceneActivation = true;
         // Allow new scene to start.
         StartCoroutine("HidePanel");yield return status;
     }
 
 
 
 }