Transferring files to remote host using SFTP using Jsch.jar

import com.jcraft.jsch.*;
import java.io.*;
import java.io.IOException;

/**
*
* @author anand
* @source http://wiki.jsch.org/index.php?Manual%2FExamples%2FSftpFileCopyExample
*/
public class sftpex {
   public static void main(String[] args) {
       // TODO code application logic here

       String username = "username";
       String host = "localhost";
       String pass = "password";
       //String khfile = "/home/testuser/.ssh/known_hosts";
       //String identityfile = "/home/testuser/.ssh/id_rsa";


       JSch jsch = null;
       Session session = null;
       Channel channel = null;
       ChannelSftp c = null;
       try {
           jsch = new JSch();
           session = jsch.getSession(username, host, 22);
           session.setPassword(pass);
           //jsch.setKnownHosts(khfile);
           //jsch.addIdentity(identityfile);
           java.util.Properties config = new java.util.Properties();
            config.put("StrictHostKeyChecking", "no");
            session.setConfig(config);
           session.connect();
           //jsch.setConfig("StrictHostKeyChecking", "no");

           channel = session.openChannel("sftp");
           channel.connect();
           c = (ChannelSftp) channel;

       } catch (Exception e) {  e.printStackTrace();    }

       try {
           System.out.println("Starting File Upload:");
           String src = "D:/Varun/SCP/1.txt";
           String dest = "C:/Documents and Settings/Administrator/SCPDemo/test123.txt";
           c.put(src, dest);

           //c.get(fdest, "/tmp/testfile.bin");
       } catch (Exception e) {  e.printStackTrace();    }

       c.disconnect();
       session.disconnect();
   }
}


//When I try to run this
javac .;path/to/jsch.0.1.5.0.jar sftpex.java
java .;path/to/jsch.0.1.5.0.jar sftpex
I get the following error message.
Starting File Upload:
4: The requested operation failed.
        at com.jcraft.jsch.ChannelSftp.throwStatusError(ChannelSftp.java:2833)
        at com.jcraft.jsch.ChannelSftp._put(ChannelSftp.java:594)
        at com.jcraft.jsch.ChannelSftp.put(ChannelSftp.java:475)
        at com.jcraft.jsch.ChannelSftp.put(ChannelSftp.java:365)
        at sftpex.main(sftpex.java:47)