Fatal error: Uncaught Error: Class 'Slim\Middleware' not found in /home/rijschoolmk/xibo.rijschool-mk.be/lib/Middleware/ApiAuthenticationOAuth.php:28 Stack trace: #0 {main} thrown in /home/rijschoolmk/xibo.rijschool-mk.be/lib/Middleware/ApiAuthenticationOAuth.php on line 28