Fatal error: Uncaught Error: Class "Symfony\Bundle\AsseticBundle\Command\AbstractCommand" not found in C:\xampp\htdocs\electronica\vendor\symfony\assetic-bundle\Command\DumpCommand.php:29 Stack trace: #0 {main} thrown in C:\xampp\htdocs\electronica\vendor\symfony\assetic-bundle\Command\DumpCommand.php on line 29