Fatal error: Uncaught Error: Class "Symfony\Component\HttpKernel\DependencyInjection\Extension" not found in C:\xampp\htdocs\electronica\vendor\symfony\assetic-bundle\DependencyInjection\AsseticExtension.php:27 Stack trace: #0 {main} thrown in C:\xampp\htdocs\electronica\vendor\symfony\assetic-bundle\DependencyInjection\AsseticExtension.php on line 27