尝试在Java ME中播放音乐,但我得到一个例外"不兼容的类型"

import javax.microedition.midlet.*;
import javax.microedition.media.*;

public class MusicPlayerMIDlet extends MIDlet {
    private Player player;

    public void startApp() {
        try {
            String url = "file:///music.mp3"; // 音乐文件的路径
            player = Manager.createPlayer(url);
            player.realize();
            player.prefetch();
            player.start();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public void pauseApp() {
        if (player != null) {
            player.stop();
        }
    }

    public void destroyApp(boolean unconditional) {
        if (player != null) {
            player.close();
        }
        notifyDestroyed();
    }
}