用于Android的JSOUP解析强制关闭

我正在尝试使用JSOUP从网站（http://hdh.ucsd.edu/mobile/dining/locationdetails.aspx?l=11）获取菜单数据，但是每当我尝试获取链接时，我的android应用就会崩溃。是什么原因？这是我的代码

public class SixthFragment extends Fragment {

String url = "http://hdh.ucsd.edu/mobile/dining/locationdetails.aspx?l=11";
ProgressDialog mProgressDialog;
String MENU;
String HOURS;
TextView textview;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

    View rootView = inflater.inflate(R.layout.fragment_sixth, container, false);
    textview = (TextView) rootView.findViewById(R.id.textView10);

    new JSOUP().execute();
    return rootView;

}

public class JSOUP extends AsyncTask<Void, Void, Void>{
    ProgressDialog dialog;

    @Override
    protected void onPreExecute(){
        super.onPreExecute();
        dialog = new ProgressDialog(getActivity());
        dialog.setMessage("loading...");
        dialog.show();

    }

    @Override
    protected Void doInBackground(Void... params){
        try{

            Document document = Jsoup.connect(url).get();
            Elements elements = document.select("a[href]");
            //HOURS = elements.text();
            System.out.println(elements.size());
            for(int i = 0; i<elements.size(); i++){

                MENU += "\n" + elements.get(i).text();
                System.out.println(i);

            }

        }

        catch (Exception e){

        }
        return null;
    }

    @Override
    protected void onPostExecute(Void result){
        dialog.dismiss();

        textview.setText(MENU);
        super.onPostExecute(result);
    }

}

}

我的错误显示为

11-28 13:48:59.175 23230-23230/com.lamdevs.tritonbites E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.lamdevs.tritonbites, PID: 23230
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference
at com.lamdevs.tritonbites.fragments.SixthFragment$JSOUP.onPostExecute(SixthFragment.java:82)
at com.lamdevs.tritonbites.fragments.SixthFragment$JSOUP.onPostExecute(SixthFragment.java:43)
at android.os.AsyncTask.finish(AsyncTask.java:632)
at android.os.AsyncTask.access$600(AsyncTask.java:177)
at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:645)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5221)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)

我不明白，因为当我输出元素的大小时，元素的大小为61。另外，有没有办法分别获取早餐，午餐和晚餐？谢谢