Fatal error: Uncaught Error: Class "Symfony\Component\Validator\Constraint" not found in /home/technoon/public_html/demo/yondy/vendor/sprain/swiss-qr-bill/src/Constraint/ValidCreditorReference.php:10 Stack trace: #0 {main} thrown in /home/technoon/public_html/demo/yondy/vendor/sprain/swiss-qr-bill/src/Constraint/ValidCreditorReference.php on line 10