Java空点

Question

Java空点

@Override
    protected void onPostExecute(String s2) {
        SharedPreferences data = context.getSharedPreferences("data", Activity.MODE_PRIVATE);
       if (s2.equals("Done")){ --error - this 
           data.edit().putString("new","1").apply();
           Intent intent = new Intent();
           intent.setClass(context.getApplicationContext(),MainActivity.class);
           context.startActivity(intent);
       } else if (s2.equals("incorrect")){
           Toast.makeText(context,"invalid",Toast.LENGTH_SHORT).show();
       }
    }