Please try to add this code to your page.
<script type="text/javascript">
$.extend($.fn.form.defaults, {
fieldTypes: ['combobox','combotree','combogrid','datetimebox','datebox','combo',
'datetimespinner','timespinner','numberspinner','spinner',
'slider','searchbox','numberbox','filebox','passwordbox','textbox','switchbutton']
});
$.extend($.fn.filebox.methods, {
setValue: function(jq){
return jq;
}
})
</script>