Fatal error: Uncaught Error: Class 'Symfony\Component\Validator\Constraint' not found in C:\xampp\htdocs\ApiSigestWin\1.0\vendor\symfony\validator\Tests\Fixtures\ConstraintA.php:17 Stack trace: #0 {main} thrown in C:\xampp\htdocs\ApiSigestWin\1.0\vendor\symfony\validator\Tests\Fixtures\ConstraintA.php on line 17