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Error en DhtmlxTreeGrid

i have this in the sample html:

<script src='../dhtmlxGrid/codebase/dhtmlxcommon.js'></script>
    <script src='../dhtmlxGrid/codebase/dhtmlxgrid.js'></script>    
    <script src='../dhtmlxGrid/codebase/dhtmlxgridcell.js'></script>
    <script src='../dhtmlxGrid/codebase/dhtmlxtreegrid.js'></script>

mygrid = new dhtmlXGridObject('gridbox');
mygrid.selMultiRows = true;
mygrid.imgURL = "../dhtmlxGrid/codebase/imgs/";
mygrid.setHeader("Tree,Plain Text");
mygrid.setInitWidths("150,100")
mygrid.setColAlign("left,left")
mygrid.setColTypes("tree,ed");
mygrid.setColSorting("str,str")
mygrid.init();
mygrid.load("test_list_1.xml");


and i have this in the xml file:

<?xml version="1.0" encoding="UTF-8" ?>
<rows parent="0">
<row id="11" open="1">
<cell image="folder.gif"> first column data </cell>
<cell> second column data </cell>
<row id="110">
<cell> first column data </cell>
<cell> second column data </cell>
</row>
</row>
<row id="12" xmlkids="1">
<cell> first column data </cell>
<cell> second column data </cell>
</row>
</rows>


when i run the application, i have this error:

JavaScript Error: Object does not support this property or method
dhtmlxgrid.js Line: 5182


and when i open the dhtmlxgrid.js file i see that linea only got this:
return this._process_tree_xml(xml);

What i suppose to do?
A File is missing?

Thanls

Please check if you have attached correct dhtmlxtreegrid.js file from the dhtmlxTreeGrid package. Such error may occur  if dhtmlxtreegrid.js file is not attached.