Fatal error: Uncaught Error: Class 'Symfony\Component\Validator\ConstraintValidator' not found in C:\xampp\htdocs\ApiSigestWin\1.0\vendor\symfony\validator\Constraints\IsbnValidator.php:28 Stack trace: #0 {main} thrown in C:\xampp\htdocs\ApiSigestWin\1.0\vendor\symfony\validator\Constraints\IsbnValidator.php on line 28