Fatal error: Uncaught Error: Class 'Doctrine\DBAL\Exception\ServerException' not found in E:\xampp\htdocs\www\yunwei\qr251\vendor\doctrine\dbal\src\Exception\NonUniqueFieldNameException.php:8 Stack trace: #0 {main} thrown in E:\xampp\htdocs\www\yunwei\qr251\vendor\doctrine\dbal\src\Exception\NonUniqueFieldNameException.php on line 8