PHP로 만든 소스를 서버로 업로드하여 안드로이드에서 DB호출을 하려고 만들었습니다.

하지만  ' PHP(이)가 중지되었습니다 ' 라는 메시지만 나오고 종료가 되는데 어디서 문제인지 모르겠습니다.

도와주세요 ㅜ

public class PHPActivity extends ListActivity {
 /** Called when the activity is first created. */
 JSONArray jArray;
 String result = null;
 InputStream is = null;
 StringBuilder sb = null;
 
 @Override
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.main);

 ArrayList<NameValuePair> nameValueParirs = new ArrayList<NameValuePair>();
 try{
 //http post
  HttpClient httpclient = new DefaultHttpClient();
  HttpPost httppost = new HttpPost("서버 주소/category.php");
  HttpResponse response = httpclient.execute(httppost);
  HttpEntity entity = response.getEntity();
  is = entity.getContent();
 }
 catch(Exception e){
  Log.e("log_tag", "Error in http connection" + e.toString());
 }
 //Convert response to string
 try
 {
  BufferedReader reader = new BufferedReader(new InputStreamReader(is, "UTF-8"),8);
  sb = new StringBuilder();
  sb.append(reader.readLine() + "\n");
  
  String line="0";
  
  while ((line = reader.readLine()) != null)
  {
   sb.append(line + "\n");
  }
  is.close();
  result = sb.toString();
 }
 catch(Exception e)
  {
   Log.e("log_tag","Error converting result "+e.toString());
  }
  //END Convert response to string
 
 String ct_name;
 
 try{
  JSONArray jArray = new JSONArray(result);
  JSONObject json_data=null;
  for(int i=0;i<jArray.length();i++){
  json_data = jArray.getJSONObject(i);
  
  ct_name = json_data.getString("category");
 }
 
}
  catch(JSONException e1)
  {
  Toast.makeText(getBaseContext(),e1.toString() ,Toast.LENGTH_LONG).show();
  }
  catch(ParseException e1){
   e1.printStackTrace();
  }
  
 }
 }