Fatal error: Uncaught Error: Class "Doctrine\DBAL\ConnectionException" not found in C:\xampp\htdocs\laravel-project\vendor\doctrine\dbal\src\Exception\CommitFailedRollbackOnly.php:9 Stack trace: #0 {main} thrown in C:\xampp\htdocs\laravel-project\vendor\doctrine\dbal\src\Exception\CommitFailedRollbackOnly.php on line 9