Fatal error: Uncaught TypeError: Argument 1 passed to CoursesController::detail() must be of the type int, string given in /var/www/html/application/controllers/CoursesController.php:15 Stack trace: #0 /var/www/html/library/core/FatApplication.class.php(0): CoursesController->detail() #1 /var/www/html/public/index.php(9): FatApplication->callHook() #2 {main} thrown in /var/www/html/application/controllers/CoursesController.php on line 15