JQuery Select2 Plugin + Laravel 5.3

I Have some problem while using Select2 Jquery Plugin cause its my 1st time use it.

    $(".select-class").select2({
    ajax: {
        url: "",
        dataType: 'json',
        type: "POST",
        data: function (term, page) {
          return {
                type: 'type_of_mine',
                kelas : kelas,
                jurusan : jurusan,
                q: term
            };
        },
        results: function (data, page) {
            return { results: data.results };
        }

    },
    initSelection: function (item, callback) {
        var id = item.val();
        var text = item.data('option');
        if(id > 0){
            var data = { id: id, text: text };
            callback(data);
        }
    },
    formatAjaxError:function(a,b,c){return"Not Found .."}
});

but i always got this error message on my console :

jquery.min.js:2 Uncaught Error: No select2/compat/initSelection(…)

can you help me please?? thanks

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