Fatal error: Uncaught Error: Class 'Doctrine\DBAL\Event\SchemaEventArgs' not found in /home/kingelearn/public_html/vendor/doctrine/dbal/lib/Doctrine/DBAL/Event/SchemaAlterTableAddColumnEventArgs.php:16
Stack trace:
#0 {main}
thrown in /home/kingelearn/public_html/vendor/doctrine/dbal/lib/Doctrine/DBAL/Event/SchemaAlterTableAddColumnEventArgs.php on line 16