อยากถาม phpmailer ครับ ...Fatal error: Call to undefined method PHPMailer::set() in

	require_once('phpmailer/class.phpmailer.php');
	$mail = new PHPMailer();
	$mail->IsHTML(true);
	$mail->IsSMTP();
	$mail->SMTPAuth = true; // enable SMTP authentication
	$mail->SMTPSecure = "ssl"; // sets the prefix to the servier
	$mail->Host = "smtp.gmail.com"; // sets GMAIL as the SMTP server
	$mail->Port = 465; // set the SMTP port for the GMAIL server
	$mail->Username = "[email protected]"; // GMAIL username
	$mail->Password = "xxxx-"; // GMAIL password
	$mail->From = "[email protected]"; // "[email protected]";
	$mail->AddReplyTo = "[email protected]"; // Reply
	$mail->FromName = "Your Name";  // set from Name
	$mail->Subject = "Test sending mail."; 
	$mail->Body = "My Body & <b>My Description</b>";

	$mail->AddAddress("[email protected]", "Mr.Adisorn Boonsong"); // to Address

	//$mail->AddAttachment("thaicreate/myfile.zip");
	//$mail->AddAttachment("thaicreate/myfile2.zip");

	//$mail->AddCC("[email protected]", "Mr.Member ShotDev"); //CC
	//$mail->AddBCC("[email protected]", "Mr.Member ShotDev"); //CC

	$mail->set('X-Priority', '1'); //Priority 1 = High, 3 = Normal, 5 = low

	$mail->Send();