Fatal error: Uncaught Error: Class "Doctrine\ORM\Persisters\AbstractCollectionPersister" not found in /home/u6668910/public_html/lab/vendor/doctrine/orm/lib/Doctrine/ORM/Persisters/ElementCollectionPersister.php:27 Stack trace: #0 {main} thrown in /home/u6668910/public_html/lab/vendor/doctrine/orm/lib/Doctrine/ORM/Persisters/ElementCollectionPersister.php on line 27