Мое простое приложение для Android продолжает падать

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public class GetSchedule extends Activity {

    // JSON Node Names
    private static final String TAG_SNO = "sno";
    private static final String TAG_STNCODE = "stnCode";
    private static final String TAG_STATION = "station";
    // private static final String TAG_ROUTENO= "routeNo";
    private static final String TAG_ARRIVALTIME = "arrivalTime";
    private static final String TAG_DEPTIME = "depTime";

    private JSONArray station = null;

    private ListView list;
    //private static String url = "http://railpnrapi.com/api/route/train/";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_get_schedule);

        try {
            ArrayList<HashMap<String, String>> stnNamelist = new    ArrayList<HashMap<String, String>>();

            // Getting JSON Array
            // JSONObject job = new JSONObject();
            //JSONArray jArray = ModuleClass.trainScheduleJSONObject.getJSONArray("stnName");
            JSONObject json_data = null;
            station= ModuleClass.trainScheduleJSONObject.getJSONArray(TAG_STATION);
            for (int i = 0; i < station.length(); i++) {
                json_data = station.getJSONObject(i);

                // JSONObject c = stnName.getJSONObject(0);

                // Storing  JSON item in a Variable

                String sno = json_data.getString(TAG_SNO);
                String stnCode = json_data.getString(TAG_STNCODE);
                // String distance= c.getString(TAG_DISTANCE);
                // String routeNo = c.getString(TAG_ROUTENO);
                String arrivalTime = json_data.getString(TAG_ARRIVALTIME);
                String depTime = json_data.getString(TAG_DEPTIME);
                // String haltTime = c.getString(TAG_HALTTIME);
                // String tday= c.getString(TAG_TDAY);
                // String remark = c.getString(TAG_REMARK);
                // Adding value HashMap key => value
                stnNamelist = new ArrayList<HashMap<String, String>>();

                HashMap<String, String> map = new HashMap<String, String>();
                map.put(TAG_SNO, sno);
                map.put(TAG_STNCODE, stnCode);
                map.put(TAG_DEPTIME, depTime);
                map.put(TAG_ARRIVALTIME, arrivalTime);
                // map.put(TAG_DEPTIME,depTime );

                stnNamelist.add(map);
                list = (ListView) findViewById(R.id.listView1);
                final SimpleAdapter sd;
                sd = new SimpleAdapter(this, stnNamelist, R.layout.activity_get_schedule, 
                        new String[] { TAG_SNO, TAG_STNCODE, TAG_ARRIVALTIME, TAG_DEPTIME },
                        new int[] { R.id.textView1, R.id.textView2, R.id.textView3, R.id.textView4});
                list.setAdapter(sd);
                /*
                 * list.setOnItemClickListener(new
                 * AdapterView.OnItemClickListener() {
                 * 
                 * @Override public void onItemClick(AdapterView<?> parent, View
                 * view, int position, long id) { Toast.makeText(
                 * MainActivity.this, "You Clicked at " +
                 * stnNamelist.get(+position).get( "name"), Toast.LENGTH_SHORT)
                 * .show(); } });
                 */
            }
            // Set JSON Data in TextView
            // uid.setText(id);
            // name1.setText(name);
            // email1.setText(email);
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }


        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.get_schedule, menu);
        return true;
    }

}