ayuda (imap y gmail en php)

Código PHP :

<?
/* connect to gmail */
$hostname = 'map.gmail.com:993/imap/ssl/novalidate-cert';
$username = '[email protected]';
$password = 'password';

/* try to connect */
$inbox = imap_open($hostname,$username,$password) or die('Cannot connect to Gmail: ' . imap_last_error());

/* grab emails */
$emails = imap_search($inbox,'ALL');

/* if emails are returned, cycle through each... */
if($emails) {
   
   /* begin output var */
   $output = '';
   
   /* put the newest emails on top */
   rsort($emails);
   
   /* for every email... */
   foreach($emails as $email_number) {
      
      /* get information specific to this email */
      $overview = imap_fetch_overview($inbox,$email_number,0);
      $message = imap_fetchbody($inbox,$email_number,2);
      
      /* output the email header information */
      $output.= '<div class="toggler '.($overview[0]->seen ? 'read' : 'unread').'">';
      $output.= '<span class="subject">'.$overview[0]->subject.'</span> ';
      $output.= '<span class="from">'.$overview[0]->from.'</span>';
      $output.= '<span class="date">on '.$overview[0]->date.'</span>';
      $output.= '</div>';
      
      /* output the email body */
      $output.= '<div class="body">'.$message.'</div>';
   }
   
   echo $output;
} 

/* close the connection */
imap_close($inbox);
?>

Error escribió: