Parsing JSON - JSONException: Integer cannot be converted to JSONObject

I'm trying to display data from a JSON file into a Listview, but I'm getting the following parsing error.

Here is my error:

An error occured while executing doInBackground()

07-25 16:01:00.754: E/JSON Parser(775): Error parsing data org.json.JSONException: Value 401 of type java.lang.Integer cannot be converted to JSONObject

Here is my JSON file:

{
    "people": [
        {
            "place": "1",
            "person": "Lisa",
            "mark": "10"
        },
        {
            "place": "2",
            "person": "Danny",
            "mark": "9"
        },
        {
            "place": "a3",
            "person": "Marc",
            "thur": "13",
            "mark": "8",
            "total": "7"
        },
        {
            "place": "b3",
            " person": "Paul ",
            "mark": "8"
        },
       {
           "place": "c5",
           "person": "Eddie",
           "thur": "8",
        "mark": "7",
        "total": "5"
       }

    ],
   "game": "First Game",
  "date": "Jul 30 2015"
 }

Here is my code:

public class InboxActivity extends ListActivity {
// Progress Dialog
private ProgressDialog pDialog;

// Creating JSON Parser object
JSONParser jsonParser = new JSONParser();

ArrayList<HashMap<String, String>> inboxList;

// products JSONArray
JSONArray inbox = null;

// Inbox JSON url
private static final String INBOX_URL = "https://www.url.com/api/v2/projects/xxx/last_ready_run/data?api_key=xxx";

// ALL JSON node names
private static final String TAG_MESSAGES = "people";
private static final String TAG_ID = "place";
private static final String TAG_FROM = "person";
private static final String TAG_EMAIL = "thur";
private static final String TAG_SUBJECT = "mark";
private static final String TAG_DATE = "total";


@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.inbox_list);

    // Hashmap for ListView
    inboxList = new ArrayList<HashMap<String, String>>();

    // Loading INBOX in Background Thread
    new LoadInbox().execute();
}

/**
 * Background Async Task to Load all INBOX messages by making HTTP Request
 * */
class LoadInbox extends AsyncTask<String, String, String> {

    /**
     * Before starting background thread Show Progress Dialog
     * */
    @Override
    protected void onPreExecute() {
        super.onPreExecute();
        pDialog = new ProgressDialog(InboxActivity.this);
        pDialog.setMessage("Loading Inbox ...");
        pDialog.setIndeterminate(false);
        pDialog.setCancelable(false);
        pDialog.show();
    }

    /**
     * getting Inbox JSON
     * */
    protected String doInBackground(String... args) {
        // Building Parameters
        List<NameValuePair> params = new ArrayList<NameValuePair>();

        // getting JSON string from URL
        JSONObject json = jsonParser.makeHttpRequest(INBOX_URL, "GET",
                params);



        // Check your log cat for JSON reponse
        Log.d("Inbox JSON: ", json.toString());

        try {
            inbox = json.getJSONArray(TAG_MESSAGES);

            inbox.toString();

            // looping through All messages
            for (int i = 0; i < inbox.length(); i++) {
                JSONObject c = inbox.getJSONObject(i);

                // Storing each json item in variable
                String id = c.getString(TAG_ID);
                String from = c.getString(TAG_FROM);
            String subject = c.getString(TAG_SUBJECT);
            String date = c.getString(TAG_DATE);

                // creating new HashMap
                HashMap<String, String> map = new HashMap<String, String>();

                // adding each child node to HashMap key => value
                map.put(TAG_ID, id);
                map.put(TAG_FROM, from);
            map.put(TAG_SUBJECT, subject);
            map.put(TAG_DATE, date);

                // adding HashList to ArrayList
                inboxList.add(map);
            }

        } catch (JSONException e) {
            e.printStackTrace();
        }

        return null;
    }

    /**
     * After completing background task Dismiss the progress dialog
     * **/
    protected void onPostExecute(String file_url) {
        // dismiss the dialog after getting all products
        pDialog.dismiss();
        // updating UI from Background Thread
        runOnUiThread(new Runnable() {
             public void run() {
                    /**
                     * Updating parsed JSON data into ListView
                     * */
                    ListAdapter adapter = new SimpleAdapter(
                            InboxActivity.this, inboxList,
                            R.layout.inbox_list_item, new String[] { TAG_FROM, TAG_SUBJECT, TAG_DATE },
                            new int[] { R.id.from, R.id.subject, R.id.date });
                    // updating listview
                    setListAdapter(adapter);
                }
        });

    }

}