PHPmailer error Language string failed to load: from_failed

I found someone who asked a similar question on this site but the accepted answer was for a windows server and I am running on Linux.

When I run the following code about ever other time I get the following error message:
Message was not sent Mailer Error: Language string failed to load: from_failedmyemail

If I hit refresh it goes through but obviously when I place this into my auto response I don’t want it to work only half the time.

require("class.phpmailer.php");
$mail = new PHPMailer();
$mail->IsSMTP(); // telling the class to use SMTP
$mail->IsHTML(true);
$mail->Host = "myhost"; // SMTP server
$mail->SMTPAuth = true;     // turn on SMTP authentication
$mail->Username = "myuser";  // SMTP username
$mail->Password = "mypass"; // SMTP password
$mail->From = "fromaddress";
$mail->FromName = "Me";
$mail->AddAddress("toaddress");
$mail->AddReplyTo("myaddress", "me");
$mail->Subject = "email test";
$mail->Body = 'my html message';


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