Fatal error: Uncaught Error: Class 'Symfony\Component\HttpFoundation\Session\Storage\MockArraySessionStorage' not found in /var/www/typo3/vendor/symfony/http-foundation/Session/Storage/MockFileSessionStorage.php:26 Stack trace: #0 {main} thrown in /var/www/typo3/vendor/symfony/http-foundation/Session/Storage/MockFileSessionStorage.php on line 26