Uniform - multiple forms with ajax

The CMS Questions
5

Ok, here comes my controller code: its in the contact-send.php file:

<?php

return function($site, $pages, $page) {
  
   $form = uniform(get('_id'), array(
     'required' => array(
       'name' => '',
       '_from' => 'email',
       'message' => '',
     ),
     'actions'  => array(
        array(
          '_action' => 'email',
          'to'      => 'mail@domain.com',
          'sender'  => 'mail@domain.com',
          'subject' => 'New Message',
          'snippet' => 'uniform/uniform-contact'
        ),
        array(
           '_action' => 'log',
           'file'    => 'log/contact-form.log'
        )
      )
    )                            
  );
  return compact("form");
};

The error I get shows just in the console:

POST "[...]/contact/send" 500 (Internal Server Error)
  send @ jquery-1.11.2.min.js:4
  m.extend.ajax @ jquery-1.11.2.min.js:4
  m.(anonymous function) @ jquery-1.11.2.min.js:4
  (anonymous function) @ support:278
  m.event.dispatch @ jquery-1.11.2.min.js:3
  r.handle @ jquery-1.11.2.min.js:3

And I didn’t change anything in the contact-send.php (JSON template).

And here my javascript:

<script type="text/javascript">
window.onload = function () {
  var ids = ["<?php echo implode('","', array_keys($page->structurefield()->yaml())) ?>"];
  for (var i = ids.length; i >= 0; i--) {
    $('#form-submit-' + ids[i]).click(function (e) {
      e.preventDefault();
      $.post(
        '<?php echo $page->children()->find('send')->url()?>',
        $('#form-' + ids[i]).serialize()
      )
  .then(function (response) {
      var feedback = $('#feedback-' + ids[i]);
      feedback.removeClass('flash-success flash-error').text(response.message);
      $('input, textarea').removeClass('erroneous');
      if (response.success) {
          feedback.addClass('flash-success');
          $('input, textarea').prop('value', '');
          $('#form-submit-' + ids[i]).prop('disabled', 'disabled');
      } else {
          feedback.addClass('flash-error');
          for (var i = response.errors.length - 1; i >= 0; i--) {
              $('[name="' + response.errors[i] + '"]').addClass('erroneous');
          };
      }
   });
  });
 }
};
</script>

Is there anything missing? Thanks one time more for your time @mzur!