Fatal error: Uncaught Error: Class "Symfony\Component\Validator\Constraint" not found in C:\laragon\www\newProject.SymfonyUser\vendor\symfony\validator\Constraints\Issn.php:24 Stack trace: #0 {main} thrown in C:\laragon\www\newProject.SymfonyUser\vendor\symfony\validator\Constraints\Issn.php on line 24