title: TypeError: 'append' called on an object that does not implement interface FormData with processData and contentType false both
body: <p>first all, scuse me my english. I'm trying to submit a form with ajax, my js code is the next: </p>
  
  <pre><code>$("#formPublicidad").on('submit', function(event) {
      event.preventDefault();
      var dataForm = new FormData(document.getElementById('formPublicidad'));
  
      if(dataForm.get('url') == '' || dataForm.get('texto') == '' || dataForm.get('imagen') == '') {
          $("#formMsg").text('Debe rellenar todos los campos');
          $("#formMsg").css('display', 'block');
      }else {
          $("#formMsg").text('Cargando...');
          $(".btn-form-pub").attr('disabled', true);
          $.ajax({
              url: 'publicidad.ajax.php', 
              method: 'POST',
              data: dataForm,
              pocessData: false,
              contentType: false,
              cache: false,
              dataType: 'json',
              success: function(response) {
                  var msg = JSON.stringify(response.msg).replace(/\"/g, "");
                  $(".btn-form-pub").attr('disabled', false);
                  if(msg != 'success') {
                      document.getElementById('formMsg').textContent = msg;
                      document.getElementById('formMsg').style = 'display: block;';
                  }else {
                      $("#formModal").modal('hide');
                  }
              }
          });
      }
  });
  </code></pre>
  
  <p>and here is my HTML code: </p>
  
  <pre><code>&lt;form method="post" id="formPublicidad"&gt;
      &lt;div class="modal-body"&gt;
          &lt;span id="formMsg"&gt;&lt;/span&gt;
          &lt;input type="hidden" name="posicion" id="pubPos"&gt;
          &lt;label for="publiUrl"&gt;URL&lt;/label&gt;
          &lt;input type="text" name="url" id="publiUrl" placeholder="Ej.: www.google.com.uy" class="form-control"&gt;
          &lt;label for="publiText"&gt;Texto&lt;/label&gt;
          &lt;input type="text" name="texto" id="publiText" placeholder="Ej.: Google" class="form-control"&gt;
          &lt;label for="publiImg"&gt;Imagen&lt;/label&gt;
          &lt;input type="file" name="imagen" id="publiImagen"&gt;
      &lt;/div&gt;
      &lt;div class="modal-footer"&gt;
          &lt;button type="button" class="btn btn-default btn-form-pub" data-dismiss="modal"&gt;Cancelar&lt;/button&gt;
          &lt;button type="submit" class="btn btn-primary btn-form-pub" id="btn-add-pub"&gt;Guardar cambios&lt;/button&gt;
      &lt;/div&gt;
  &lt;/form&gt;
  </code></pre>
  
  <p>when I try to submit via ajax in the console I have the next error: </p>
  
  <blockquote>
    <p>TypeError: 'append' called on an object that does not implement interface FormData.</p>
  </blockquote>
  
  <p>I has maked this anothers times but now don't work. 
  Please somebody can help? Thank you a lot!!</p>