Tree grid -new to dhtmlx

I’m new to dhtmlx usage…i’m trying to use treegrid which matches with my requirement.I had created treegrid.xml in the same format which u had given in the site.But i’m getting this error

Error: this._process_tree_xml is not a function
Source File: file d:/ffff/dhtmlxgrid.js
Line: 4524

can any one provide me the soution for this problem…

Please check if you have attached dhtmlxtreegrid.js file from the dhtmlxTreeGrid package.