Fatal error: Uncaught Error: Class 'Doctrine\DBAL\Schema\Comparator' not found in E:\xampp\htdocs\www\yunwei\qr251\vendor\doctrine\dbal\src\Platforms\MySQL\Comparator.php:20 Stack trace: #0 {main} thrown in E:\xampp\htdocs\www\yunwei\qr251\vendor\doctrine\dbal\src\Platforms\MySQL\Comparator.php on line 20