Got exception with PHPMailer, please help

[peterchq]

Got this exception:

Message was not sent
Mailer Error : Language string failed to load: data_not_accepted

Here is the code
<?php
ini_set("include_path", ".;c:\php\includes");
require("class.phpmailer.php");

$mail = new PHPMailer();

$mail->IsSMTP(); // send via SMTP
$mail->Host = "localhost"; // SMTP servers

$mail->From = "[e-mail]";
$mail->AddAddress("[e-mail]");

$mail->Subject = "Here is the subject";
$mail->Body = "This is the HTML body ";
$mail->WordWrap = 50;

if(!$mail->Send())
{
echo "Message was not sent <p>";
echo "Mailer Error : " . $mail->ErrorInfo;
exit;
}
echo "Message has been sent";
?>

Please advise

[dewen]

add line as:
$mail->SMTPDebug = 2;

in code:

$mail = new PHPMailer();
$mail->SMTPDebug = 2;