Fatal error: Uncaught Error: Class "Doctrine\ORM\Persisters\Collection\AbstractCollectionPersister" not found in /var/www/html/API_Forum/vendor/doctrine/orm/src/Persisters/Collection/ManyToManyPersister.php:33 Stack trace: #0 {main} thrown in /var/www/html/API_Forum/vendor/doctrine/orm/src/Persisters/Collection/ManyToManyPersister.php on line 33