Почему не работает ajax запрос в ie?

$.ajax({
            type: "GET",
            url: "http://www.json-generator.com/api/json/get/bZtGcVPsrS?indent=2",
            success: function (data) {
                var items = [];
                $.each(data, function (i, el) {
                    $.each(el, function (key, val) {
                        items.push('\n' + key + ' : ' + val);
                    });
                });
                items.sort();
                alert(items);
            },
            error: function () {
                alert("An error has occurred, please try again");
            }
        });