android - parse from xml webservice contain only a string -

i got next problem have xml webservice contain string example: enter invalis data wanna read string app. code working perfect suddnly start return html code not string whic want :( here code:

try {      string xx;      defaulthttpclient httpclient = new defaulthttpclient(); ;       httpget httppost = new httpget(urlstring);      httpresponse httpresponse = httpclient.execute(httppost);     httpentity httpentity = httpresponse.getentity();     inputstream = httpentity.getcontent();      bufferedreader reader = new bufferedreader(new inputstreamreader(inputstream, "utf-8"),             8);     stringbuilder stringbuilder = new stringbuilder();     string line = null;     if ((line = reader.readline()) != null) {         stringbuilder.append(line + "\n");         xx = stringbuilder.tostring();         }        inputstream.close();       }     catch (unsupportedencodingexception e) {         system.err.print("unsupportedencodingexception: " + e);     }     catch (clientprotocolexception e) {         system.err.print("clientprotocolexception: " + e);     }     catch (ioexception e) {         system.err.print("ioexception: " + e);     } 

so pleas if 1 can !!!