Erro no meu programa q toca MIDI

package teste.guj;

import java.io.File;
import java.io.IOException;

import javax.sound.midi.InvalidMidiDataException;
import javax.sound.midi.MidiSystem;
import javax.sound.midi.MidiUnavailableException;
import javax.sound.midi.Sequence;
import javax.sound.midi.Sequencer;
import javax.swing.JFileChooser;
import javax.swing.filechooser.FileFilter;

public class TesteMidi {
	public static void main(String args[]) {
		try {
			JFileChooser chooser = new JFileChooser();
			chooser.setFileFilter(new FileFilter() {
				@Override
				public String getDescription() {
					return "midi";
				}

				@Override
				public boolean accept(File f) {
					return f.isDirectory() || f.getName().endsWith("mid");
				};
			});
			if (chooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION) {
				Sequence sequence = MidiSystem.getSequence(chooser.getSelectedFile());
				// da erro nessa linha, mas nao sei pq
				Sequencer sequencer = MidiSystem.getSequencer();
				sequencer.open();
				sequencer.setSequence(sequence);

				// Start playing
				sequencer.start();
				Thread.sleep(10000);
				sequencer.close();
			}
		} catch (InvalidMidiDataException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} catch (MidiUnavailableException e) {
			e.printStackTrace();
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
	}
}