Metti le librerie e gli script come t'ho postato prima in quel ordine (fai copia incolla) e cambia questo pezzo
codice:
<script type="text/javascript">
            $(function() {
                $(".data:input").datepicker({
                        numberOfMonths : [3,4]
                });
            });                        
          </script>
            
          <script type="text/javascript">
            $(function() {
                $('#slider_example_1').timepicker({
                hourGrid: 4,
                minuteGrid: 10
                });
            });                        
          </script>
            
            
            
          <script>
              jQuery(document).ready(function(){
                  // binds form submission and fields to the validation engine
                  jQuery("#f_form_aula").validationEngine();
              });                            
          </script>
con questo
codice:
<script type="text/javascript">
            $(function() {
                $(".data:input").datepicker({
                        numberOfMonths : [3,4]
                });
                $('#slider_example_1').timepicker({
                hourGrid: 4,
                minuteGrid: 10
                });                       
                  $("#f_form_aula").validationEngine();
              });                            
          </script>