Fatal error: Uncaught Error: Class "Symfony\Component\HttpFoundation\Session\Storage\Handler\AbstractSessionHandler" not found in C:\Apache24\htdocs\cms_upgrade\vendor\symfony\http-foundation\Session\Storage\Handler\MongoDbSessionHandler.php:22 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cms_upgrade\vendor\symfony\http-foundation\Session\Storage\Handler\MongoDbSessionHandler.php on line 22