Excuse-me I had forgotten to mail the code

class MyMidilet entends midlet
{
MyGame theGame;
.......
.......
......
............
protected void startApp()
{
...........
this.myThread = new Thread(theGame,"Game");
myTherad.start();
}
}
class MyGame .....{
public MyGame()
{
...
.........
.............
for(i=0;i<Song.length-1;i++)
{
Song
=Manager.createPlayer(getClass().getResourceAsStream(AudioGame),"audio/midi");// ecco dove si verifica l'errore
Song.realize();
Song.prefetch();
}
.........
............
..................
}
}