Fatal error: Uncaught TypeError: Invalid return value: callable object expected, "null" returned from "I:/www/frameworks/Symfony/doctrine/vendor/autoload_runtime.php". in I:\www\frameworks\Symfony\doctrine\vendor\autoload_runtime.php:18 Stack trace: #0 {main} thrown in I:\www\frameworks\Symfony\doctrine\vendor\autoload_runtime.php on line 18