2 Errors in script for the editor

I took this script from the Unity website to mess around with and copy pasted it and it is not working and gave me 2 errors (I dit not modify it).

 /// C# Example
 // Simple script that saves frames from the Game View when on play mode
 //
 // You can put later the frames togheter and create a video.
 // Note: The frames are saved next to the Assets folder.
 
 using UnityEngine;
 using UnityEditor;
 
 public class SimpleRecorder : EditorWindow {
     string fileName = "FileName";
 
     string status = "Idle";
     string recordButton = "Record";
     bool recording = false;
     float lastFrameTime = 0.0f;
     int capturedFrame = 0;
 
     [MenuItem ("Example/Simple Recorder")]
     static void Init () {
         SimpleRecorder window = 
             (SimpleRecorder)EditorWindow.GetWindow(typeof(SimpleRecorder));
     }
 
     void OnGUI () {
         fileName = EditorGUILayout.TextField ("File Name:", fileName);
         
         if(GUILayout.Button(recordButton)) {
             if(recording) { //recording
                 status = "Idle...";
                 recordButton = "Record";                
                 recording = false;
             } else { // idle
                 capturedFrame = 0;
                 recordButton = "Stop";
                 recording = true;
             }
         }
         EditorGUILayout.LabelField ("Status: ", status);
     }
     
     void Update () {
         if (recording) {
             if (EditorApplication.isPlaying && !EditorApplication.isPaused){
                 RecordImages();
                 Repaint();
             } else
                 status = "Waiting for Editor to Play";
         }
     }
     
     void RecordImages() {
         if(lastFrameTime < Time.time + (1/24f)) { // 24fps
             status = "Captured frame " + capturedFrame;
             Application.CaptureScreenshot(fileName + " " + capturedFrame + ".png");
             capturedFrame++;
             lastFrameTime = Time.time;    
         }
     }
 }

(source: http://docs.unity3d.com/Documentation/ScriptReference/EditorWindow.Update.html)

the ERROS: Instance of SimpleRecorder couldn't be created because there is no script with that name. UnityEditor.EditorWindow:GetWindow(Type) SimpleRecorder:Init() (at Assets/Editor/BlackCoreEditorWindow.cs:16)

NullReferenceException: Object reference not set to an instance of an object UnityEditor.EditorWindow.GetWindow (System.Type t, Boolean utility, System.String title, Boolean focus) (at C:/BuildAgent/work/7535de4ca26c26ac/Editor/MonoGenerated/Editor/EditorWindow.cs:418) UnityEditor.EditorWindow.GetWindow (System.Type t) (at C:/BuildAgent/work/7535de4ca26c26ac/Editor/MonoGenerated/Editor/EditorWindow.cs:402) SimpleRecorder.Init () (at Assets/Editor/BlackCoreEditorWindow.cs:16)

How do I fix this?