Warning: Undefined variable $app in C:\xampp\htdocs\teste\backend\src\Routes\routes.php on line 5

Fatal error: Uncaught Error: Call to a member function get() on null in C:\xampp\htdocs\teste\backend\src\Routes\routes.php:5 Stack trace: #0 {main} thrown in C:\xampp\htdocs\teste\backend\src\Routes\routes.php on line 5