Gridview bind Problem with json when using url routing

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ASP.NET

C#5.0

hello all

i am binding gridview(Product.aspx page) with json .when i am running direct this page then working fine but when i am redirecting from Category.aspx to Product.aspx with some Value and Url Routing then it show error
please help me anyone.

my json code is -

<script type="text/javascript">
        var pageIndex = 0;
        var pageCount;
        $(window).scroll(function () {
            var height = $(window).height() + 1000;
            if ($(window).scrollTop() > $(document).height() - height) {
                GetRecords();
            }
        });
        $(function () {
            GetRecords();
        });
        function GetRecords() {
            pageIndex++;
            if (pageIndex == 1 || pageIndex <= pageCount) {
                $("#loader").show();
                $.ajax({
                    type: "POST",
                    url: "Product.aspx/GetImages",
                    data: '{pageIndex: ' + pageIndex + '}',
                    contentType: "application/json; charset=utf-8",
                    dataType: "json",
                    success: OnSuccess,
                    failure: function (response) {
                        alert(response.responseText);
                    },
                    error: function (response) {
                        alert(response.responseText);
                    }
                });
            }
        }
        function OnSuccess(response) {
            var xmlDoc = $.parseXML(response.d);
            var xml = $(xmlDoc);
            pageCount = parseInt(xml.find("PageCount").eq(0).find("PageCount").text());
            var images = xml.find("tbl_SubCategory");
            var repeatColumns = parseInt("<%=dlImages.RepeatColumns == 0 ? 1 : dlImages.RepeatColumns %>");
        var rowCount = Math.ceil(images.length / repeatColumns);
        var j = 0;
        images.each(function () {
            var image = $(this);
            var row = $("[id*=dlImages] .item:last").closest("tr");
            if ($(".is_used[value='1']", row).length == repeatColumns) {
                row = $("[id*=dlImages] tr").eq(0).clone();
                $(".is_used", row).val("0");
                $(".image", row).attr("src", "");
                $(".button", row).attr("href", "");
                $(".loader", row).remove();
                $("[id*=dlImages]").append(row);
                j = 0;
            } else {
                row = $("[id*=dlImages] .item:last").closest("tr");
            }
            var cell = $(".item", row).eq(j);
            $(".name", cell).html(image.find("Cat_Name").text());
            $(".button", cell).attr("href", image.find("Cat_Image").text());
            $(".is_used", cell).attr("value", "1");
            var img = $(".image", cell);
            var loader = $("<img class = 'loader' src = 'Adminimage/loader.gif' />");
            img.after(loader);
            img.hide();
            img.attr("src", image.find("Cat_Image").text());
            img.load(function () {
                $(this).parent().find(".loader").remove();
                $(this).fadeIn();
            });
            j++;
        });
        $("[id*=dlImages] .is_used[value='0']").closest(".item").remove();
    }
    </script>

Error are showing -

No web Service found.