This script named "AutoFade"

 using UnityEngine;
 using System.Collections;
  
 public class AutoFade : MonoBehaviour
 {
     private static AutoFade m_Instance = null;
     private Material m_Material = null;
     private string m_LevelName = "";
     private int m_LevelIndex = 0;
     private bool m_Fading = false;
  
     private static AutoFade Instance
     {
         get
         {
             if (m_Instance == null)
         {
         m_Instance = (new GameObject("AutoFade")).AddComponent<AutoFade>();
     }
     return m_Instance;
     }
 }
 public static bool Fading
 {
     get { 
     return Instance.m_Fading; }
 }
  
 private void Awake()
 {
     DontDestroyOnLoad(this);
     m_Instance = this;
     m_Material = new Material("Shader \"Plane/No zTest\" { SubShader { Pass { Blend SrcAlpha OneMinusSrcAlpha ZWrite Off Cull Off Fog { Mode Off } BindChannels { Bind \"Color\",color } } } }");
 }
  
 private void DrawQuad(Color aColor,float aAlpha)
 {
     aColor.a = aAlpha;
     m_Material.SetPass(0);
     GL.Color(aColor);
     GL.PushMatrix();
     GL.LoadOrtho();
     GL.Begin(GL.QUADS);
     GL.Vertex3(0, 0, -1);
     GL.Vertex3(0, 1, -1);
     GL.Vertex3(1, 1, -1);
     GL.Vertex3(1, 0, -1);
     GL.End();
     GL.PopMatrix();
 }
  
 private IEnumerator Fade(float aFadeOutTime, float aFadeInTime, Color aColor)
 {
     float t = 0.0f;
     while (t<1.0f)
     {
         yield return new WaitForEndOfFrame();
         t = Mathf.Clamp01(t + Time.deltaTime / aFadeOutTime);
         DrawQuad(aColor,t);
     }
     if (m_LevelName != "")
     Application.LoadLevel(m_LevelName);
     else
     Application.LoadLevel(m_LevelIndex);
     while (t>0.0f)
     {
         yield return new WaitForEndOfFrame();
         t = Mathf.Clamp01(t - Time.deltaTime / aFadeInTime);
         DrawQuad(aColor,t);
     }
     m_Fading = false;
     }
     private void StartFade(float aFadeOutTime, float aFadeInTime, Color aColor)
     {
         m_Fading = true;
         StartCoroutine(Fade(aFadeOutTime, aFadeInTime, aColor));
     }
  
     public static void LoadLevel(string aLevelName,float aFadeOutTime, float aFadeInTime, Color aColor)
     {
         if (Fading) return;
         Instance.m_LevelName = aLevelName;
         Instance.StartFade(aFadeOutTime, aFadeInTime, aColor);
     }
     public static void LoadLevel(int aLevelIndex,float aFadeOutTime, float aFadeInTime, Color aColor)
     {
         if (Fading) return;
         Instance.m_LevelName = "";
         Instance.m_LevelIndex = aLevelIndex;
         Instance.StartFade(aFadeOutTime, aFadeInTime, aColor);
     }
 }

This script is named "LoadLevel"

 using UnityEngine;
 using System.Collections;
  
 public class LoadLevel : MonoBehaviour
 {
 void OnTriggerEnter(Collider other){
     AutoFade.LoadLevel("Home" ,3,1,Color.black);
     }
 }

"I got an error "The class defined in script file named 'LoadLevel' does not match the file name!"