I did it according to the teacher's method. I don't know what's wrong. I've been looking for it all day and can't find it.

Question

Answer 1

1. Change empty to is_null

2. Change parent::initialize(); to parent::_initialize();
   

Answer 2

Still wrong

Answer 3

if(is_null(USER_ID)) {
$this -> error('The user is not logged in and has no access rights, please log in',url('user/login'));
}