Fatal error: Uncaught TypeError: Invalid return value: callable object expected, "int" returned from "public/router.php". in /app/vendor/autoload_runtime.php:12 Stack trace: #0 /app/public/index.php(5): require_once() #1 /app/public/router.php(21): require('/app/public/ind...') #2 {main} thrown in /app/vendor/autoload_runtime.php on line 12