How to fix 'Cannot access the default controller' using Codeigniter 4.2.6? – PHP

I have a problem working with URI routing in Codeigniter 4.2.6. I have Controller name Home and a method name getIndex. When accessing http://localhost:8080 all working fine. When I try http://localhost:8080/home/index, a message 'Cannot access the default controller "Home" with the controller name URI path' comes up. I set $routes->setAutoRoute(true); and public bool $autoRoutesImproved = true;. The same problem when I create another method getAbout. Accessing http://localhost:8080/home/about resulting a message Cannot accessing... as well.

The same problem when using Sub directory to separate logic. This is my code of subdirectory name Admin :

<?php

namespace AppControllersAdmin;
use AppControllersBaseController;

class Home extends BaseController
{
    public function getIndex()
    {
        # code...
    }

    public function getAbout()
    {
        echo 'This is '.__METHOD__;
    }
}

and trying to access it get the same result Cannot access the default controller "Home" with the controller name URI path.

So how to work with URI Routing in codeigniter 4 especially 4.2.6 using Auto Routing enable and Manual Routing ?

Thank you in advance.

UPDATE

This is my Routes.php

<?php

namespace Config;

// Create a new instance of our RouteCollection class.
$routes = Services::routes();

// Load the system's routing file first, so that the app and ENVIRONMENT
// can override as needed.
if (is_file(SYSTEMPATH . 'Config/Routes.php')) {
    require SYSTEMPATH . 'Config/Routes.php';
}

/*
 * --------------------------------------------------------------------
 * Router Setup
 * --------------------------------------------------------------------
 */
$routes->setDefaultNamespace('AppControllers');
$routes->setDefaultController('Home');
$routes->setDefaultMethod('index');
$routes->setTranslateURIDashes(false);
$routes->set404Override();
// ...
// If you don't want to define all routes, please use the Auto Routing (Improved).
// Set `$autoRoutesImproved` to true in `app/Config/Feature.php` and set the following to true.
$routes->setAutoRoute(true);

/*
 * --------------------------------------------------------------------
 * Route Definitions
 * --------------------------------------------------------------------
 */

// We get a performance increase by specifying the default
// route since we don't have to scan directories.
$routes->get('/', 'Home::index');