How to send files using Smack?

Hello,

I am struggling with this code:

FileTransferManager manager = new FileTransferManager(connection)

OutgoingFileTransfer transfer = manager.createOutgoingFileTransfer(“gmailusername@gmail/Smack”);

try {
System.out.println(“000”);
transfer.sendFile(new File(“D:/cow.wav”), “Moo !”);
System.out.println(“111”);
while(!transfer.isDone())
{
System.out.println(transfer.getProgress() + " is done!");
//System.out.println(transfer.getStreamID() + " is done!");
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
} catch (XMPPException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

It seams that it can’t send the file.

Can anyone help me solve this problem ?