Fatal error: Uncaught Error: Class "Doctrine\DBAL\Schema\AbstractSchemaManager" not found in /opt/lampp/htdocs/forum/flarum/vendor/doctrine/dbal/lib/Doctrine/DBAL/Schema/MySqlSchemaManager.php:25 Stack trace: #0 {main} thrown in /opt/lampp/htdocs/forum/flarum/vendor/doctrine/dbal/lib/Doctrine/DBAL/Schema/MySqlSchemaManager.php on line 25