Estou usando o analisador SAX para analisar uma resposta XML, mas gera uma exceçã

ExpatParser$ParseException : (not well formed) invalid token

Existe alguma solução?

Aqui está o meu código:

    HttpParams params = new BasicHttpParams();  
    HttpProtocolParams.setContentCharset(params, "UTF-8");
    HttpPost postMethod = new HttpPost(MyRequestURL);  

    DefaultHttpClient hc = new DefaultHttpClient(params); 

    postMethod.setEntity(new UrlEncodedFormEntity(nameValuePairs));
    ResponseHandler <String> res = new BasicResponseHandler();  
    String response=hc.execute(postMethodURL,res); 


    ByteArrayInputStream byteArrayInputStream = 
        new ByteArrayInputStream(response.getBytes("UTF8"));

    /* SAXParser from the SAXPArserFactory. */
    SAXParserFactory spf = SAXParserFactory.newInstance();
    SAXParser sp = spf.newSAXParser();

    /* Get the XMLReader of the SAXParser we created. */
    XMLReader xr = sp.getXMLReader();

    /* Create a new ContentHandler and apply it to the XML-Reader*/ 
    MyHandler objHandler = new MyHandler();
    xr.setContentHandler(objHandler);      

   InputSource inputSource = new InputSource(byteArrayInputStream);
   inputSource.setEncoding("UTF-8");

   /* Parse the xml-data from our URL. */

   xr.parse(inputSource);

   /* Parsing has finished. */