Notice: Undefined variable: app in E:\xampp\htdocs\api.sis\src\routes.php on line 19

Fatal error: Uncaught Error: Call to a member function get() on null in E:\xampp\htdocs\api.sis\src\routes.php:19 Stack trace: #0 {main} thrown in E:\xampp\htdocs\api.sis\src\routes.php on line 19