Why doesnt my PHPMailer work?

Question

I tried the exact same thing in another separate file and it works! But when I put it here it doesn't. I guess the code is colliding somewhere. I want it to like display the error message if the credentials are wrong and if they are correct it will send e-mail. If I remove/comment the php mailer code it works. So if I add the php-mailer code it doesn't work.

Here's my activate.php:

<!DOCTYPE html>
<html>
  <head>
    <title>NHG</title>
    <meta charset="UTF-8"/>
    <meta name="viewport" content="width=device-width, initial-scale=1.0"/>
    <link type="text/css" rel="stylesheet" href="css/normalize.css"/>
    <link type="text/css" rel="stylesheet" href="css/style.css"/>
    <link type="text/css" rel="stylesheet" href="css/resposive.css"/>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
    <script src="JS/script.js"></script>
    <script src="JS/activate.js"></script>
  </head>
  <body>
    <div id="abhimanyu">
      <p>"Life will test you but remember this, when you walk up a mountain your legs get stronger"</p>
    </div>
    <div id="arjun">
      <p>"There is no such thing as a failed experiment, only experiments with unexpected outcomes"</p>
    </div>
    <br>
    <div id="bheem">
      <p>"Do not look where you fell, but where you slipped."</p>
    </div>
    <div id="eklavya">
      <p>"Sometimes life touches one person with a bouquet and another with a thorn bush, but the first may find a wasp in the flowers, and the second may discover roses among the thorns."</p>
    </div>
    <header>
            <div id="main-head">    
              <a href="#" id="main-heading"><h2><span>sKool</span><span>Talk</span></h2></a>
            </div>
    </header>
    <section>
      <div id="container">
        <div id="wrapper">
          <img src="https://i.imgsafe.org/a40bbe047e.png" alt="avatar" id="schoolAvatar" align="middle">
          <div id="activateAccountDiv">
            <form id="activateAccount" data-param-uri="activate">
                <input type="hidden" name="action" value="Activated"/>
              <input type="text" name="activateAdmissionNumber" id="activateAdmissionNumber" placeholder="Enter your asmission number..."/>
              <br>
              <input type="password" name="activatePassword" id="activatePassword" placeholder="Enter your generated Password...">
              <br>
              <button type="submit" id="activateSubmitButton">
                <p>Next</p>
              </button> 
              <br>
              <p id="activateErrorMessage"></p>
            </form>
            <br>
          </div>
        </div>
      </div>
    </section>
    <br>
    <footer>
      <div class="footerHR">
      </div>
    </footer>
  </body>
</html>

Heres my JS/activate.js:

    var _Form, _Site = {_Resp: 'default_global'};

    $(document).ready(function() {

      $("#activateAdmissionNumber").on('blur',function(e){
          $(document).find("#activateErrorMessage").html("");
      });
      $("#activatePassword").on('blur',function(e){
          $(document).find("#activateErrorMessage").html("");
      });

      $("#activateAccount").on('submit',function(e){
        e.preventDefault();
        $data = $(this).serialize();
        $URL = 'php/'+$(this).attr('data-param-uri')+'.php';
        _Form.__Link($URL, $data,function (return_data){
          if(typeof (return_data.url) !== 'undefined' && return_data.success === true ){
            $(document).find("#activateErrorMessage").html("");
            window.location.href = return_data.url;
          }else{
            $(document).find("#activateErrorMessage").html(return_data.msg);
            }
          });
      });  
       _Form = {
          __Link: function ($url, $data, callback){
            $.ajax({
              url: $url,
              data: $data,
              type: 'POST',
              dataType: 'json',
              processData: false,
              contentType: 'application/x-www-form-urlencoded',
              cache:false,
              success: function (data) {
                        callback(data);
                       }
              });
          }
        }
    });

Heres my PHP/activate.php:

    <?php
      require_once('connect.php');
      if(isset($_POST)) {  
          if($_POST['action'] === "Activated"){
              unset($_POST['action']);
            echo activateUser($_POST);exit;
          }      
          // you can use this if  statement as your method filter logic
      }

      function activateUser($FORMDATA){
          global $conn; // define you db coonection use every time if you use further my code style

          if(empty($FORMDATA)){ $RESP['success'] = false;$RESP['msg'] = "NullData";return json_encode($RESP);} //  cross check data is empty or not

          $sql = "SELECT * FROM Users WHERE AdmissionNumber='".$FORMDATA['activateAdmissionNumber']."' AND Password='".$FORMDATA['activatePassword']."';";
          $result = $conn->query($sql);
          $row = $result->fetch_assoc();

          //if only one user is there than is valid
          if(($result->num_rows) == 1){
              $sql =  "UPDATE `NewHorizonGurukul`.`Users` SET `Activate`='1' WHERE `ID`='".$row['ID']."';";

              require_once '../phpmailer/PHPMailerAutoload.php';

              $mail = new PHPMailer;

              //$mail->SMTPDebug = 3;                               // Enable verbose debug output

              $mail->isSMTP();                                      // Set mailer to use SMTP
              $mail->Host = 'smtp.gmail.com';  // Specify main and backup SMTP servers
              $mail->SMTPAuth = true;                               // Enable SMTP authentication
              $mail->Username = 'shreyas.sreenivasa@gmail.com';                 // SMTP username
              $mail->Password = 'jaihind123';                           // SMTP password
              $mail->SMTPSecure = 'tls';                            // Enable TLS encryption, `ssl` also accepted
              $mail->Port = 587;                                    // TCP port to connect to

              $mail->setFrom('from@example.com', 'Mailer');
              $mail->addAddress('shreyas.sreenivasa@gmial.com', 'Joe User');     // Add a recipient
              $mail->addAddress('ellen@example.com');               // Name is optional
              $mail->addReplyTo('info@example.com', 'Information');
              $mail->addCC('cc@example.com');
              $mail->addBCC('bcc@example.com');

              $mail->addAttachment('/var/tmp/file.tar.gz');         // Add attachments
              $mail->addAttachment('/tmp/image.jpg', 'new.jpg');    // Optional name
              $mail->isHTML(true);                                  // Set email format to HTML

              $mail->Subject = 'Here is the subject';
              $mail->Body    = 'This is the HTML message body <b>in bold!</b>';
              $mail->AltBody = 'This is the body in plain text for non-HTML mail clients';

              if(!$mail->send()) {
                echo 'Message could not be sent.';
                echo 'Mailer Error: ' . $mail->ErrorInfo;
              } else {
                echo 'Message has been sent';
              }

              $RESP['success'] = true;
              $RESP['msg'] = "Your acount has been activated!";
              $RESP['url'] = 'NHGLogin.php';
          }else{
              $RESP['success'] = false;
              $RESP['msg'] = "Please enter a valid Username or Password!";
          }
          return json_encode($RESP);// Js Accept Json Responses
      }
    ?>

Thank you in advance!

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Shreyas Sreenivasa

Shreyas Sreenivasa

Why doesnt my PHPMailer work?