J2SSH - SFTPFile (Error getting file handle)

Dear Friends:
I am using the J2ssh API, I have written a java code to get an Sftpfile as:

  sftpClient = ssh.openSftpClient();
  List list = sftpClient.ls();
  SftpFile sftpfile = (SftpFile) list.get(2);//get single SftpFile
  SftpFileInputStream br = new SftpFileInputStream(sftpfile);


  when I run, I get following error,
  ++++++++++++++++++++++++++++++++++++++++++
  java.io.IOException: The file does not have a valid handle!


Can somebody help me out..
Thanks in advance !!!



Thanks & Regards,
Amit Mathur