Error in Defining JSONObject [closed]

Question

i have created a code to parse the data(job listings) from my website and should make it displayed in Android app, i have used JSON parser to do this task, So installed JSON api in the website, project is bug free, but when i run i'm not getting the output... i think i have gone wrong in defining the JSONobject. Here's my code

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.httpex);
    httpStuff = (TextView) findViewById(R.id.tvHttp);
    client = new DefaultHttpClient();
    new Read().execute("posts");
    }
    public JSONObject lastTweet(String string) throws ClientProtocolException, IOException, JSONException {
        StringBuilder url = new StringBuilder(URL);
        url.append(string);
        HttpGet get = new HttpGet (url.toString());
        HttpResponse r = client.execute(get);
        int status = r.getStatusLine().getStatusCode();
        if (status==200){
            HttpEntity e=r.getEntity();
            String data = EntityUtils.toString(e);
            JSONArray Categories = new JSONArray(data);
            JSONObject Featured = Categories.getJSONObject(1);
            return Featured;
        }
        else
        {
            Toast.makeText(HttpExample.this, "error", Toast.LENGTH_LONG);
            return null;
        }
    }
    public class Read extends AsyncTask<String, Integer, String>{

        @Override
        protected String doInBackground(String... params) {
            // TODO Auto-generated method stub
            try{
            json = lastTweet("mybringback");
            return json.getString(params[0]);
            }
            catch (ClientProtocolException e) {
                e.printStackTrace();
            }
            catch (IOException e){
                e.printStackTrace();
            }
            catch (JSONException e){
                e.printStackTrace();
            }

            return null;
        }

This code was done by following some tutorial where that was to parse the twitter content, so i edited the url and JSONobject by mine. so please help me to correct the errors.