Fatal error: Uncaught Error: Class "Symfony\Component\DependencyInjection\Extension\Extension" not found in /var/www/html/vendor/doctrine/doctrine-fixtures-bundle/src/DependencyInjection/DoctrineFixturesExtension.php:16 Stack trace: #0 {main} thrown in /var/www/html/vendor/doctrine/doctrine-fixtures-bundle/src/DependencyInjection/DoctrineFixturesExtension.php on line 16