I keep getting an error even though my code is the exact same

KaraokeMachine machine = new KaraokeMachine(songBook);                                                                                                                    
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import com.teamtreehouse.KaraokeMachine;
import com.teamtreehouse.model.Song;
import com.teamtreehouse.model.SongBook;

public class Karaoke {
  public static void main(String[] args) {
//    Song song = new Song(
//      "Michael Jackson", 
//      "Beat It",
//      "https://www.youtube.com/watch?v=SaEC9i9QOvk");
    SongBook songBook = new SongBook();
//    System.out.printf("Adding %s %n", song);
//    songBook.addSong(song);
//    System.out.printf("There are %d song. %n", songBook.getSongCount());
    KaraokeMachine machine = new KaraokeMachine(songBook);
    machine.run();
  }

}

package com.teamtreehouse;

import com.teamtreehouse.model.Song;
import com.teamtreehouse.model.SongBook;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;

public class KaraokeMachine {
  private SongBook mSongBook;
  private BufferedReader mReader;
  private Map<String, String> mMenu;

  public KaraokeMachine(SongBook songBook) throws IOException {
    mSongBook = songBook;
    mReader = new BufferedReader(new InputStreamReader(System.in));
    mMenu = new HashMap<String, String>();
    mMenu.put("add", "Add a new sont to the song book");
    mMenu.put("quit", "Give up? Exit the program");
  }

  private String promptAction() throws IOException {
    System.out.printf("There are %d songs available. Your options are %n", mSongBook.getSongCount());
    for (Map.Entry<String, String> option : mMenu.entrySet()) {
      System.out.printf("%s - %s %n", option.getKey(), option.getValue());
    }
    System.out.print("What do you want to do: ");
    String choice = mReader.readLine();
    return choice.trim().toLowerCase();
  }

  public void run() {
    String choice = "";
    do {
      try {
      choice = promptAction();
      switch (choice) {
        case "add":
          //TODO: Add a new song
        Song song = promptNewSong();
        mSongBook.addSong(song);
        System.out.printf("%s added! %n%n", song);
          break;
        case "quit":
          System.out.println("Thanks for playing!");
          break;
        default:
          System.out.printf("Unknown choice: '%s'. Try again. %n%n%n", choice);
        }
      }
      catch(IOException ioe) {
        System.out.println("There was a problem with your input");
        ioe.printStackTrace();
      }
    }
    while(!choice.equals("quit"));
  }

  private Song promptNewSong() throws IOException {
    System.out.print("Enter the artist's name: ");
    String artist = mReader.readLine();
    System.out.print("Enter the title: ");
    String title = mReader.readLine();
    System.out.print("Enter the video URL: ");
    String videoURL = mReader.readLine();

    return new Song(artist, title, videoURL);
  }

}