Third part Library error

//Tell PHPMailer to use SMTP
$mail->isSMTP();

//Enable SMTP debugging
// 0 = off (for production use)
// 1 = client messages
// 2 = client and server messages
$mail->SMTPDebug = 2;

//Ask for HTML-friendly debug output
$mail->Debugoutput = 'html';

//Set the hostname of the mail server
$mail->Host = 'smtp.gmail.com';

//Set the SMTP port number - 587 for authenticated TLS, a.k.a. RFC4409 SMTP submission
$mail->Port = 587;

//Set the encryption system to use - ssl (deprecated) or tls
$mail->SMTPSecure = 'tls';

//Whether to use SMTP authentication
$mail->SMTPAuth = true;

//Username to use for SMTP authentication - use full email address for gmail
$mail->Username = "aderreyra@gmail.com";

//Password to use for SMTP authentication
$mail->Password = "I put here my password";

//Set who the message is to be sent from
$mail->setFrom($email, 'First Last');

    //Set who the message is to be sent to
$mail->addAddress("aderreyra@gmail.com", 'Ader Reynoso');

//Set the subject line
$mail->Subject = 'PHPMailer GMail SMTP test';
$email_body = "";
$email_body = $email_body ."Name: " .$name ."<br>";
$email_body = $email_body ."Email: " .$email ."<br>";
$email_body = $email_body ."Mensaje:" .$message. "\n";



    if(!$mail->Send()) {
      echo "Hay un error No se puede mandar el email " . $mail->ErrorInfo;
      exit;
    }

header("Location: contact.php?status=thanks");
exit;

    <h1>Contact</h1>
    <?php if (isset($_GET["status"]) AND $_GET["status"] == "thanks") {?>
    <p>Thanks for the Email.I&rsquo;ll be in touch Shortly.</p>
        <?php } else{ ?>


            <p>I&rsquo;d love to hear from you! Complete the form to send me an e-mail.</p>
                <form method="post" action="<?php echo $_SERVER['PHP_SELF'] ?>">
                    <table>
                        <tr>
                            <th>
                        <label for="name">Name</label>
                            </th>
                            <td>
                        <input type="text" name="name" id="name">
                            </td>
                        </tr>
                        <tr>
                            <th>
                        <label for="email">E-mail</label>
                            </th>
                            <td>
                        <input type="text" name="email" id="email">
                            </td>
                        </tr>
                        <tr>
                            <th>
                        <label for="message">Message</label>
                            </th>
                            <td>
                        <textarea name="message" id="message"></textarea> 
                            </td>
                        </tr>
                        <tr style="display:none;">
                            <th>
                        <label for="address">Address</label>
                            </th>
                            <td>
                        <input type="text" name="address" id="address">
                        <p>"Si eres humano por favor no llenes esta información"</p>
                            </td>
                        </tr>
                    </table>
                    <input type="submit" value="Send">
                </form>
            <?php } ?>  
</div>