Возвращаемый массив json не показывает результат в вызывающем скрипте

I я размещаю значение в модальном диалоговом окне, а затем некоторые операции с базой данных. Теперь я возвращаю значение через

header('Content-Type: application/json', true, 200); 
echo json_encode(array('status' => 'active')); 
exit();

Это правильный путь? Все операции с базой данных выполняются правильно, но console.info(result) ничего не показывает в вызывающем скрипте. Что-то не так с парой строк выше. Было бы очень полезно, если бы кто-нибудь указал на ошибку.

 <div class = "modal fade" id = "myModal"  role = "dialog" data-backdrop = "static" data-keyboard = "false">

    <div class = "modal-dialog">

      <!-- Modal content-->

<form name = "frmActive" id = "frmActive" action = "" method = "post">      
      <div class = "modal-content" style = "height:250px;">
        <div class = "modal-header">
          <button type = "button" class = "close" data-dismiss = "modal">&times;</button>
          <h4 class = "modal-title">Ideal Time activation</h4>
        </div>
        <div class = "modal-body">
          <p>Please enter activation <b>PIN</b><font color = "red">*</font><br>

          <p id = "msg" style = "color:#F00;"></p>
          <input type = "password" name = "pin" id = "pin" value = "" maxlength = "4"  onKeyUp = "checkNumber(this)"  class = "form-control" placeholder = "Enter Pin">
          <input type = "hidden" id = "inactiveTime">
          <p style = "font-size:11px"><b><font color = "red">*</font><font color = "grey"><b>PIN</b><i> is mentioned in your welcome email.</font></i></b></p><br>

        </div>
        <div class = "modal-footer">

       <button type = "button" id = "btnSubmit" name = "submit" value = "submit" class = "btn btn-success"><i class = "glyphicon glyphicon-floppy-disk"></i> Continue</button> 
       <input type = "hidden" id = "module_id" value = "<?php echo $moduleId ; ?>">
       <input type = "hidden" id = "chapter_id" value = "<?php echo $chapterId ; ?>">

        </div>
      </div>
</form>      
   </div>
  </div>
jQuery("#btnSubmit").on("click", function(){

    var pin             =   jQuery("#pin").val();
    var chapter_id      =   jQuery("#chapter_id").val();
    var module_id       =   jQuery("#module_id").val();
    var nowDate         =   jQuery.now();
    var inactiveTime    =   jQuery("#inactiveTime").val();
    var seconds         =   (nowDate - inactiveTime) / 1000;

    var formData    =   new FormData();
        formData.append("pin", pin);
        formData.append("seconds", seconds);
        formData.append("module_id", module_id);
        formData.append("chapter_id", chapter_id);

      $.ajax({
        url: "processActivation.php",
        type: "POST",
        data: formData,
        processData: false,
        contentType: false,

        success: function(result){          


           if (result['status'] == 'active')

            {

                jQuery('#myModal').modal('hide');
            }
            else
            {

                $("#msg").html(result) ;

            }

        }
      });

});

And processActivation.php,

<?php
$uid        =   $_SESSION['session_user_id'];
$dobCheck   =   $db->idToField("tbl_user", "dob", $uid);
$dob        =   explode("-", $dobCheck);

$pin            =   $_REQUEST['pin'];
$moduleId       =   $_REQUEST['module_id'];
$chapterId      =   $_REQUEST['chapter_id'];
$time_taken     =   $_REQUEST['seconds'];
$created        =   date("Y-m-d h:i:s");
if ($pin != $dob[0])
{

    echo "Please enter valid PIN."; die;
}
else
{

    $dataactivation =   array("user_id"=>$uid, "module_id"=>$moduleId, "chapter_id"=>$chapterId,"time_taken"=>$time_taken, "created"=>$created);
    $db->query_insert("tbl_activation", $dataactivation);   


  header('Content-Type: application/json', true, 200); 
  echo json_encode(array('status' => 'active')); 
  exit(); 
}

?>  

И мой браузер показывает,

Loading failed for the <script> with source “http://localhost/project/js/compatibility.js”.
studyChapterpdf.php:54
Use of captureEvents() is deprecated. To upgrade your code, use the DOM 2 addEventListener() method. For more help http://developer.mozilla.org/en/docs/DOM:element.addEventListener
studyChapterpdf.php:240:36
ReferenceError: fakewaffle is not defined[Learn More]
studyChapterpdf.php:492:3
Warning: Setting up fake worker.
pdf.js:1489:5
progress 
Object { loaded: 131072, total: 551963 }
bootstrap-pdf-viewer.js:563:9
progress 
Object { loaded: 551963, total: 551963 }
bootstrap-pdf-viewer.js:563:9
page=1 - getOperatorList: time=522ms, len=755