Fatal error: Uncaught Error: Class 'Symfony\Component\DependencyInjection\Loader\FileLoader' not found in /var/www/typo3/vendor/symfony/dependency-injection/Loader/DirectoryLoader.php:19
Stack trace:
#0 {main}
thrown in /var/www/typo3/vendor/symfony/dependency-injection/Loader/DirectoryLoader.php on line 19