jqGrid不显示分页链接

我这里有一些遗留代码，我使用jqGrid对一些XML数据进行分页。XML包含354条记录，页面加载后会立即显示前20条记录，但jqGrid不会显示浏览其他记录并对其进行分页的链接。

我确信jqGrid得到了完整的XML，它甚至说Viewing 1 - 20 of 354，但实际上并没有让我分页。

如果我输入分页编号（例如，第2页为"2"）并输入它，它就会发出HTTP请求（返回200状态），什么也不做！

这是分页的JS代码：

$(document).ready(function() {
    erc_id = $('#erc_id').val();
    jQuery("#list4").jqGrid({
        url: "/ercs/" + erc_id + "/exemplares.xml",
        datatype: "xml",
        width: 650,
        pager: "gridPager",
        height: 'auto',
        xmlReader: {
            root: "exemplares",
            row: "exemplar",
            repeatitems: false,
            id: "id"
        },
        colNames: ['Código', 'Referência', 'Num. Controle', 'Dt. Moldagem', 'Traço'],
        colModel: [
            {
            name: 'codigo',
            index: 'codigo',
            width: 60,
            sortable: false},
        {
            name: 'referencia',
            index: 'referencia',
            width: 160,
            sortable: false},
        {
            name: 'numero-controle',
            index: 'numero-controle',
            width: 60,
            sortable: false,
            align: 'center'},
        {
            name: 'data-moldagem',
            index: 'data-moldagem',
            width: 60,
            sortable: false},
        {
            name: 'traco',
            index: 'traco',
            width: 60,
            sortable: false,
            xmlmap: "traco>reference"},
            ],
        viewrecords: true,
        caption: "Exemplares",
        subGrid: true,
        subGridRowExpanded: function(subgrid_id, row_id) {
            var subgrid_table_id = subgrid_id + "_t";
            my_row_id = row_id
            $("#" + subgrid_id).html("<table id='" + subgrid_table_id + "' class='scroll'></table>");
            row_id = row_id.replace("5687", "");
            jQuery("#" + subgrid_table_id).jqGrid({
                url: "/ercs/" + erc_id + "/exemplares/" + row_id + "/cps.xml",
                datatype: "xml",
                height: 'auto',
                width: 550,
                xmlReader: {
                    root: "cps",
                    row: "cp",
                    repeatitems: false,
                    id: "id"
                },
                colNames: ['Número', 'Carga', 'Idade', 'Prensa', 'Retifica', 'Ruptura', 'retifica', 'N cont antigo'],
                colModel: [
                    {
                    name: "numero",
                    index: "numero",
                    width: 60,
                    sortable: false},
                {
                    name: "carga",
                    index: "carga",
                    width: 50,
                    sortable: false,
                    align: 'center'},
                {
                    name: "idade",
                    index: "idade",
                    width: 30,
                    sortable: false,
                    align: 'center'},
                {
                    name: "prensa",
                    index: "carga",
                    width: 30,
                    sortable: false,
                    align: 'center'},
                {
                    name: "carga",
                    index: "carga",
                    width: 50,
                    sortable: false,
                    align: 'center'},
                {
                    name: "ruptura",
                    index: "ruptura",
                    width: 50,
                    sortable: false,
                    align: 'center'},
                {
                    name: "retifica",
                    index: "retifica",
                    width: 50,
                    sortable: false,
                    align: 'center'},
                {
                    name: "numero-controle-antigo",
                    index: "numero-controle-antigo",
                    width: 50,
                    sortable: false,
                    align: 'center'}
                            ]
            });
        },
        ondblClickRow: function(id) {
            id = id.replace("5687", "");
            if (typeof my_row_id !== "undefined") {
                my_row_id = my_row_id.replace("5687", "");
                window.location = "/ercs/" + erc_id + "/exemplares/" + my_row_id + "/cps/" + id + "/edit"
            } else {
                window.location = "/ercs/" + erc_id + "/exemplares/" + id + "/edit"
            }
        },
    });
});​

如果你知道可能导致这个错误的原因，请告诉我。