send data and image to PHP through AJAX

I am trying to pass my data along with an image to php but it was throwing error undefined index my code is as follows

HTML

<form class="form-horizontal" name="event" id="event" enctype="multipart/form-data">
 <input type="text" name="txtEName" id="txtEName" required/>
 <input type="text" name="txtEFree" required placeholder="(in minutes)"/>
 <input type="text" name="txtEFirstPay" required/>
 <input type="text" name="txtEFirstDuration" placeholder="(in minutes)"/>
 <input type="file" name="files[]" multiple/> 
 <button type="button" id="saveEvent">SAVE</button>
</form

AJAX

 $("#saveEvent").on('click',(function() {
      var formData = new FormData($("#event"));
      $.ajax({
        url: "saveEvent.php", 
        type: 'POST',
        data: formData, 
        contentType: false,
        cache: false
        processData:false,
        success: function(data)
        {
          //further...
        }
      });
     }));

PHP

<?php
  require_once ("Php/db_connect.php");
  $name=$_REQUEST['txtEName'];
  echo var_dump($name);
  $free=$_REQUEST['txtEFree'];
  fpay=$_REQUEST['TxtEFirstPay'];
  $fduration=$_REQUEST['txtEFirstDuration'];
  $filename=$_FILES['filename']['name'];
  //upload code follows...
 ?>

When i try to echo $name its showing the error

Notice: Undefined index: txtEName

what is the problem in this. anybody please help..