Fatal error: Uncaught Error: Interface 'Symfony\Component\Security\Core\User\UserCheckerInterface' not found in C:\Apache24\htdocs\cwbts\vendor\symfony\security-core\User\UserChecker.php:24 Stack trace: #0 {main} thrown in C:\Apache24\htdocs\cwbts\vendor\symfony\security-core\User\UserChecker.php on line 24