Fatal error: Uncaught Error: Class "Symfony\Component\Config\Loader\Loader" not found in C:\xampp\htdocs\electronica\vendor\symfony\assetic-bundle\Routing\AsseticLoader.php:39 Stack trace: #0 {main} thrown in C:\xampp\htdocs\electronica\vendor\symfony\assetic-bundle\Routing\AsseticLoader.php on line 39