phpmailer ส่ง email แล้ว Error : RSET failed กับ Language string failed to load: tls ครับ

function smtpmail( $email , $subject , $body )
{
    $mail = new PHPMailer();
    $mail->SMTPAuth = true;   
    $mail->SMTPSecure = "tls";
    $mail->IsSMTP();
    $mail->CharSet = "utf-8";  
    $mail->Host     = "smtp.gmail.com"; 
    $mail->Port     ='587';
   
    $mail->Username = "[email protected]";  
    $mail->Password = "xxxx";  
     $mail->SMTPDebug  = 2;

    $mail->From     = "[email protected]";  
    $mail->FromName = "Test"; //  
    $mail->AddAddress($email);           
    $mail->IsHTML(false);                
    $mail->Subject     =  $subject;       
    $mail->Body     = $body;                  
     $result = $mail->send();
     return $result;
}
$check = smtpmail( "[email protected]" , "Test" , "Test BOdy");

if (!$check) {
    echo "Send Error";
} else {
    echo "Send complete.";
}