dinhcode on "Easy FancyBox Button helper"

hello,

How to add Button helper to Easy FancyBox Plugin.

i have add to footer but my site not show Button helper

<script type="text/javascript">
jQuery(document).on('ready post-load', function() {
$('.fancybox').fancybox({ openEffect : 'none', closeEffect : 'none', prevEffect : 'none', nextEffect : 'none', closeBtn : false, arrows : false, nextClick : true, helpers : { title : { type : 'inside' }, buttons : {}, thumbs : { width : 50, height : 50 } }, afterLoad : function() { this.title = 'Image ' + (this.index + 1) + ' of ' + this.group.length + (this.title ? ' - ' + this.title : ''); }
});
} );
</script>

Any for support. Thanks

https://wordpress.org/plugins/easy-fancybox/