trying to send mail using swift mailer, gmail smtp, php

Here is my code:

<?php

require_once 'Swift/lib/swift_required.php';



$transport = Swift_SmtpTransport::newInstance('smtp.gmail.com', 465)

  ->setUsername('me@ff.com')

  ->setPassword('pass');



$mailer = Swift_Mailer::newInstance($transport);

$message = Swift_Message::newInstance('Wonderful Subject')

  ->setFrom(array('me@ff.com' => 'MY NAME'))

  ->setTo(array('you@ss.com' => 'YOU'))

  ->setBody('This is the text of the mail send by Swift using SMTP transport.');

//$attachment = Swift_Attachment::newInstance(file_get_contents('path/logo.png'), 'logo.png');  

//$message->attach($attachment);

$numSent = $mailer->send($message);

printf("Sent %d messages\n", $numSent);

?>

AFter RUNNING GOT THIS ERROR...

Fatal error: Uncaught exception 'Swift_TransportException' with message 'Expected response code 220 but got code "", with message ""' in /home/sitenyou/public_html/Swift/lib/classes/Swift/Transport/AbstractSmtpTransport.php:406

Stack trace: 

#0 /home/sitenyou/public_html/Swift/lib/classes/Swift/Transport/AbstractSmtpTransport.php(299): Swift_Transport_AbstractSmtpTransport->_assertResponseCode('', Array) 

#1 /home/sitenyou/public_html/Swift/lib/classes/Swift/Transport/AbstractSmtpTransport.php(107): Swift_Transport_AbstractSmtpTransport->_readGreeting() 

#2 /home/sitenyou/public_html/Swift/lib/classes/Swift/Mailer.php(74): Swift_Transport_AbstractSmtpTransport->start() 

#3 /home/sitenyou/public_html/sgmail.php(16): Swift_Mailer->send(Object(Swift_Message)) 

#4 {main} thrown in /home/sitenyou/public_html/Swift/lib/classes/Swift/Transport/AbstractSmtpTransport.php on line 406

Source: Tips4all