用phpmailer发邮件的时候出现有关问题

用phpmailer发邮件的时候出现问题
require_once('class.phpmailer.php'); //下载的文件必须放在该文件所在目录
$address=$_POST['address'];
echo $address."
";
$mail = new PHPMailer(); //建立邮件发送类
$address = $_POST['address'];
$mail->IsSMTP(); // 使用SMTP方式发送
$mail->Host = "smtp.163.com"; // 您的企业邮局域名
$mail->SMTPAuth = true; // 启用SMTP验证功能
$mail->Username = "*********@163.com"; // 邮局用户名(请填写完整的email地址)
$mail->Password = "********"; // 邮局密码
$mail->From = "******@163.com"; //邮件发送者email地址
$mail->FromName = "";
$mail->AddAddress("$address", "QQ");//收件人地址，可以替换成任何想要接收邮件的email信箱,
$mail->Subject = "PHPMailer测试邮件"; //邮件标题
$mail->Body = "Hello,这是测试邮件"; //邮件内容
$mail->AltBody = "This is the body in plain text for non-HTML mail clients"; //附加信息，可以省略

if(!$mail->Send())
{
echo "邮件发送失败.

";
echo "错误原因: " . $mail->ErrorInfo;
exit;
}

echo "邮件发送成功";
?>

Warning: preg_match() [function.preg-match]: Compilation failed: reference to non-existent subpattern at offset 626 in C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\class.phpmailer.php on line 667
邮件发送失败.
错误原因: You must provide at least one recipient email address.