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Android Threads and Services Threads in Android Extending Thread

Why can't the editor understand Thread.sleep?

I'm not sure what I'm doing wrong, but the fact that I can't use Android Studio code in this editor is a bit frustrating.

The editor is saying that my code isn't right when it's the same code the teacher used.

MainActivity.java
public class MainActivity extends Activity {
    TwitterClient twitterClient = new TwitterClient();

    @Override
    public void onCreate(Bundle savedInstanceState) {
      setContentView(R.layout.activity_main);


      DownloadThread thread = new DownloadThread();
      thread.setName("");
      thread.start();

    }

  public class DownloadThread extends Thread {


    @Override
    public void run() {
        for (String song: Playlist.songs) {
            downloadSong();
    }
    }

    private void downloadSong() {
        long endTime = System.currentTimeMillis() + 10*1000;
        while (System.currentTimeMillis() < endTime) {
            try {
                Thread.sleep(1000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
}


}

I've added the missing Playlist.songs just as an array inside DownloadThread called "songs".