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Creo que es mas, un error a la hora de crear el documento XmlhttpRequest, usa esto. 
 Código PHP:
    function createXmlHttpRequestObject()
{
try{
                    var xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");
                }
                catch(e)
                {
                    try
                    {
                        var xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
                    }
                    catch(e)
                    {
                        var xmlhttp = false;
                    }
                }
                return (!xmlhttp && typeof XMLHttpRequest!='undefined')?
                new XMLHttpRequest():xmlhttp || new function(){};
} 
    
   
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