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Problem with find option in Tree using JSON

Hello,
I am using evaluation package of dhtmlxSuite 2009 Rel.2 DHTMLX 2.5.

I am working on tree using loadJSON for data. I included find option, I got below error if there is no matched node/data.

Message: 'this.item' is null or not an object - Line: 201 -Char: 14 - Code: 0 -URI: http://10.0.0.110/dhtmlxsuite/dhtmlxTree/codebase/dhtmlxtree.js

The same code is working without any errors If I use loadXML for data and Included my code:
<link rel="STYLESHEET" type="text/css" href="dhtmlxTree/codebase/dhtmlxtree.css">
<script src="dhtmlxTree/codebase/dhtmlxcommon.js"></script>
<script src="dhtmlxTree/codebase/dhtmlxtree.js"></script>
<script src="dhtmlxTree/codebase/ext/dhtmlxtree_json.js"></script>

<div>
    <input type="text" id="stext" width="200px">
    <a href="javascript:void(0)" onClick="tree.findItem(document.getElementById('stext').value,0,1)"> Find </a> |
    <a href="javascript:void(0)" onClick="tree.findItem(document.getElementById('stext').value)"> Find Next</a> |
    <a href="javascript:void(0)" onClick="tree.findItem(document.getElementById('stext').value,1)"> Find Prev </a>
</div>

<div id="treeboxbox_tree" style="width:250px; height:218px;background-color:#f5f5f5;border :1px solid Silver;; overflow:auto;"/>

<script>
    tree = new dhtmlXTreeObject("treeboxbox_tree", "100%", "100%", 0);
    tree.setSkin('dhx_skyblue');
    tree.setImagePath("dhtmlxTree/codebase/imgs/csh_bluebooks/");
    tree.enableSmartXMLParsing(true);
    tree.enableTreeLines(0);
    //tree.loadXML("tree3_14_selection_sorting_navigation.xml");
    tree.loadJSON("big_data.json");
</script>

Please let me know there are anychanges need to be done from my end or Do I need to download the latest files.
Thanks,
RamaRao R.