Problems using FullCalendar with ajax

I'm using FullCalendar 2.2.3 and I want to update the DB when users modify any of its events. This is the definition of the calendar: ``` $('#calendar').fullCalendar({ firstDay: 1, timezone: 'Europe/Madrid', allDayDefault: false, theme: false, aspectRatio: 2.2, timeFormat: 'H:mm', header: { left: '', center: 'title', right: 'today prev,next' }, editable: false, eventMouseover: function(event, jsEvent, view) { if (view.name !== 'agendaDay') { $(jsEvent.target).attr('title', event.title); } }, events: { url: '/getEvents.php', type: 'POST', cache: false, error: function() { // error }, }, eventDrop: function(event, delta, revertFunc) { if (!confirm("Are you sure about this change?")) { revertFunc(); } } }); ``` This works fine, but when I change eventDrop to update the DB ``` eventDrop: function(event, delta, revertFunc) { var parameters = { "idevento" : event.id, "fecha" : event.start }; $.ajax({ type: "POST", data: parameters, url: '/cambiarFechaEventoUsuario.php', success: function(data) { var res = jQuery.parseJSON(data); if (res.error == 0) { alert('OK'); } else { alert('No OK'); } }, error: function(e) { alert('Server error'); } }); } ``` I get the following error: TypeError: this._ordinalParse is undefined moment.min.js (línea 6, col 17468) Also, if I use the file "es.js" (I'm spanish), I get a different error: TypeError: e is undefined es.js (línea 1, col 453) I haven't changed anything about either of these two js files, obviously. Does anyone know how to fix this? Thanks in advance and sorry for my english :(