CI 4 4.0.0-beta.3 routing error

I see documentation
If you are building a large application you might want to hierarchically organize or structure your controllers into sub-directories

Directory structure - see attachments

UserController.php

Code:

<?php namespace App\Controllers;

use CodeIgniter\Controller;

class UserController extends Controller
{
public function login()
{
echo '1';
}



}

request:   http://my_domain/admin/usercontroller/login

result: 404 - File Not Found

Routes.php - $routes->setAutoRoute(true);

This don't work, please help fix it;

Attached Files

Thumbnail(s)
   

If "UserController" is in app/Controllers/admin, then its namespace should match. i.e. namespace App\Controllers\admin;

Thank's