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dhtmlx not working

I am using the following code snippet in my jsp for autocomplete combo box,

<div id="acProjectCode" style="width:200px; height:30px;"></div>    

<script language="javascript">
    var projectAutoCompleteBox = new dhtmlXCombo("acProjectCode", "projectCode", 200);
    projectAutoCompleteBox.enableFilteringMode(true,"${pageContext.request.contextPath}/autoProjectSearchAction.do",true,true);        
</script>

The combobox is not getting populated with any values, could you please tell me what the issue could be?