jQuery Grid Plugin - jqGrid

hiii....,

i'm a newbie..

i have an issue use tree grid..

my grid can't show..

i have a tree grid that have configuration like that:

    jQuery("#west-grid").jqGrid({
        url: "tree.xml",
        datatype: "xml",
        height: "auto",
        pager: false,
        loadui: "disable",
        colNames: ["id","Menu","url"],
        colModel: [
            {name: "id",width:1,hidden:true, key:true},
            {name: "menu", width:150, resizable: true, sortable:false},
            {name: "url",width:1,hidden:true}
        ],
        treeGrid: true,
        treeGridModel : "adjacency",
        caption: "Tree Grid Testing",
        ExpandColumn: "menu",
        //autowidth: true,
        width: 196,
        rowNum: 6,
        ExpandColClick: true,        
        treeIcons: {leaf:'ui-icon-document-b'},
        onSelectRow: function(rowid) {
            var treedata = $("#west-grid").jqGrid('getRowData',rowid);
            if(treedata.isLeaf=="true") {
                //treedata.url
                var st = "#t"+treedata.id;
                if($(st).html() != null ) {
                    maintab.tabs('select',st);
                } else {
                    maintab.tabs('add',st, treedata.menu);
                    $(st,"#tabs").load(treedata.url);
                    /*$.ajax({
                        url: treedata.url,
                        type: "POST",
                        dataType: "html",
                        complete : function (req, err) {
                            $(st,"#tabs").append(req.responseText);
                        }
                    });*/
                }
            }
        },
        loadError : function(xhr, status, error) {
            console.log(xhr);
            console.log(status);
            console.log(error);
            if (xhr.responseText.length > 0) {
                $('#error').replaceWith('<b>'+xhr.responseText+'</b>');
            }
        }
    });

and my xml data like that :

<?xml version='1.0' encoding="utf-8"?>
<rows>
    <page>1</page>
    <total>1</total>
    <records>1</records>
    <row><cell>1</cell><cell>Operational</cell><cell></cell><cell>0</cell><cell></cell><cell>false</cell><cell>false</cell></row>
    <row><cell>2</cell><cell>Input</cell><cell></cell><cell>1</cell><cell>1</cell><cell>false</cell><cell>false</cell></row>
    <row><cell>3</cell><cell>Reservation</cell><cell>localex.html</cell><cell>2</cell><cell>2</cell><cell>true</cell><cell>false</cell></row>
    <row><cell>4</cell><cell>Invoice</cell><cell>localex.html</cell><cell>2</cell><cell>2</cell><cell>true</cell><cell>false</cell></row>
    <row><cell>5</cell><cell>Reports</cell><cell></cell><cell>1</cell><cell>1</cell><cell>false</cell><cell>false</cell></row>
    <row><cell>6</cell><cell>Master Data</cell><cell></cell><cell>1</cell<cell>1</cell><cell>false</cell><cell>false</cell></row>
        
</rows>

when i reduce my xml code that row cell id are 5 and 6, my tree grid is work fine..

when i'm not reduce the row that have cell id are 5 and 6, my grid not show..

is my xml code has wrong? 

can some one explain me?

Best Regards,

zenixgrace