Fatal error: Uncaught Error: Class 'Symfony\Component\HttpKernel\DependencyInjection\Extension' not found in /home/users/00/3c/21/home/www/vendor/doctrine/doctrine-migrations-bundle/DependencyInjection/DoctrineMigrationsExtension.php:18 Stack trace: #0 {main} thrown in /home/users/00/3c/21/home/www/vendor/doctrine/doctrine-migrations-bundle/DependencyInjection/DoctrineMigrationsExtension.php on line 18