Always no routes defined in module router PHP practitioner

I already view a video about PHP practitioners in the part router. I think it must be can get the route instead of it always undefine like " Fatal error: Uncaught Exception: no routes define for this uri in C:\laragon\www\laracast-php-begin\Core\router.php:18 Stack trace: #0 C:\laragon\www\laracast-php-begin\index.php(15): router->direct('about') #1 {main} thrown in C:\laragon\www\laracast-php-begin\Core\router.php on line 18"

Index.php

core/router.php