PHPMailer error. Called Mail() without being connected

Hello guys i get this error,

Message could not be sent.Mailer Error: The following From address failed: hehe.gmail.com : Called Mail() without being connected.

<?php
require '/PHPMailer_5.2.4/class.phpmailer.php';

$mail = new PHPMailer;

$mail->IsSMTP();                                      // Set mailer to use SMTP
$mail->Host = 'smtp.gmail.com';  // Specify main and backup server
$mail->SMTPAuth = true;                               // Enable SMTP authentication
$mail->Username = 'hehe@gmail.com';                            // SMTP username
$mail->Password = 'xxx';                           // SMTP password
$mail->SMTPSecure = 'ssl';                            // Enable encryption, 'ssl' also accepted
$mail->Port = 465;

$mail->From = 'hehe@gmail.com';
$mail->FromName = 'Mailer';
$mail->AddAddress('hehe@gmail.com');  // Add a recipient

$mail->WordWrap = 50;                                 // Set word wrap to 50 characters
$mail->IsHTML(true);                                  // Set email format to HTML

$mail->Subject = 'Here is the subject';
$mail->Body    = 'This is the HTML message body <b>in bold!</b>';
$mail->AltBody = 'This is the body in plain text for non-HTML mail clients';

if(!$mail->Send()) {
   echo 'Message could not be sent.';
   echo 'Mailer Error: ' . $mail->ErrorInfo;
   exit;
}

echo 'Message has been sent';

How can i fix it? Thanks!