No direct script access allowed

hi,
I am converting my CI3 application to CI4.
I am facing this error
No direct script access allowed
I have included the following code, but it always, says

Code:

No direct script access allowed
defined('BASEPATH') OR exit('No direct script access allowed');

Here is controller:

Code:

<?php
namespace App\Controllers;
defined('BASEPATH') OR exit('No direct script access allowed');

// echo "This is home home home";
// die();

// http://www.2my4edge.com/2015/12/complete-basic-insert-view-edit-delete.html

use App\Models\MainModel;
use App\Models\Users_model;
use App\Models\login_database;

class Home extends BaseController
{