Fatal error: Uncaught TypeError: Invalid return value: callable object expected, "int" returned from "public/router.php". in /var/www/html/vendor/autoload_runtime.php:12 Stack trace: #0 /var/www/html/public/index.php(5): require_once() #1 /var/www/html/public/router.php(14): require_once('/var/www/html/p...') #2 {main} thrown in /var/www/html/vendor/autoload_runtime.php on line 12