java + sftp

I execute the program:

public class SshExample {

    /**
     * @param args
     */

    public static void main(String[] args) {
        // TODO Auto-generated method stub
      SshClient ssh = new SshClient();

    try {
        String hostname = "localhost";
        System.out.print("Host to connect: " + hostname);
        ssh.connect(hostname);
// ssh.connect("localhost", new
ConsoleKnownHostsKeyVerification());

        PasswordAuthenticationClient pwd = new
PasswordAuthenticationClient();

        String username = "anabolik";
        System.out.print("Username: " + username);
        pwd.setUsername(username);

        String password = "111";
        System.out.print("Password: " + password);
        pwd.setPassword(password);

        int result = ssh.authenticate(pwd);

        if(result==AuthenticationProtocolState.FAILED)
            System.out.println("The authentication failed");

         if(result==AuthenticationProtocolState.PARTIAL)
            System.out.println("The authentication succeeded but
another"
                           + "authentication is required");

         if(result==AuthenticationProtocolState.COMPLETE)
            System.out.println("The authentication is complete");

         SftpClient sftp = ssh.openSftpClient();

    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    }

}

When the execute the line SftpClient sftp = ssh.openSftpClient(); I
have error:

SEVERE: The Transport Protocol thread failed
java.lang.NegativeArraySizeException
    at com.sshtools.j2ssh.io.ByteArrayReader.readString(Unknown Source)
    at
com.sshtools.j2ssh.connection.SshMsgChannelOpenFailure.constructMessage(Unknown
Source)
    at com.sshtools.j2ssh.transport.SshMessage.fromByteArray(Unknown
Source)
    at com.sshtools.j2ssh.transport.SshMessageStore.createMessage(Unknown
Source)
    at
com.sshtools.j2ssh.transport.TransportProtocolCommon.processMessages(Unknown
Source)
    at
com.sshtools.j2ssh.transport.TransportProtocolCommon.startBinaryPacketProtocol(Unknown
Source)
    at com.sshtools.j2ssh.transport.TransportProtocolCommon.run(Unknown
Source)
    at java.lang.Thread.run(Thread.java:619)
java.io.IOException: The message store has reached EOF
    at
com.sshtools.j2ssh.connection.ConnectionProtocol.openChannel(Unknown
Source)
    at com.sshtools.j2ssh.SshClient.openChannel(Unknown Source)
    at com.sshtools.j2ssh.SshClient.openSftpChannel(Unknown Source)
    at com.sshtools.j2ssh.SftpClient.<init>(Unknown Source)
    at com.sshtools.j2ssh.SshClient.openSftpClient(Unknown Source)
    at com.sshtools.j2ssh.SshClient.openSftpClient(Unknown Source)
    at research.SshExample.main(SshExample.java:71)

What can do?