Android :: Unknown Exception For Create Object Of FileTransferManager() Of Smack Library / Solve It

I am trying to create object of FileTransferManager manager = new FileTransferManager(this.connection);

it is giving error, the same error gives for , OutgoingFileTransfer otransfer = manager.createOutgoingFileTransfer("nimit@pc3/Smack");

I am testing demo app for android, smack library and openfire server (FileTransfer settings are enabled in open fire).

What is solution for this.

But when I put

try{

FileTransferManager manager = new FileTransferManager (this.connection);

}catch(Exception e){}