Fatal error: Uncaught Error: Class "Symfony\Component\HttpFoundation\Session\Storage\Handler\AbstractSessionHandler" not found in /srv/www/sites/public/starter-cms/vendor/symfony/http-foundation/Session/Storage/Handler/MemcachedSessionHandler.php:22 Stack trace: #0 {main} thrown in /srv/www/sites/public/starter-cms/vendor/symfony/http-foundation/Session/Storage/Handler/MemcachedSessionHandler.php on line 22