confusing error during realize of mediaplayer

I'm geting a strange error when I try and play a simple midi 1.0 file.
The file is definitely valid, and plays in every other midi enabled
application I have.
The error occurs when I try and realize() the player. After about 3
seconds I get

Error: Unable to prefetch
com.sun.media.content.audio.midi.Handler$MidiController@c3c749

my code is

public class form1 extends javax.swing.JFrame {

    File fp = new File("C:/TEST.MID");
    Player player;

    /** Creates new form form1 */
    public form1() {
        initComponents();
        this.setVisible(true);
        if (!fp.exists()) return;
        try {

            player=Manager.createPlayer(fp.toURL());

        } catch (MalformedURLException ex) {
            ex.printStackTrace();
        } catch (NoPlayerException ex) {
            ex.printStackTrace();
        } catch (IOException ex) {
            ex.printStackTrace();
        }

        player.addControllerListener( new ControllerListener() {
            public void controllerUpdate( ControllerEvent ce) {
              if ( ce instanceof RealizeCompleteEvent)
              {
                  Component visual = player.getVisualComponent();
                  Component control =
player.getControlPanelComponent();
                  if (visual != null)
                      getContentPane().add(visual);
                  getContentPane().add(control);
                  pack();
                  player.start();
              }
            }
        });
    player.realise(); // here's where it says it can't preload
sun...midi etc

    }

any help would be appreciated