Fatal error: Uncaught Error: Class 'Doctrine\ORM\Persisters\Collection\AbstractCollectionPersister' not found in /var/www/html/navirre.com/htdocs/concrete/vendor/doctrine/orm/lib/Doctrine/ORM/Persisters/Collection/ManyToManyPersister.php:28 Stack trace: #0 {main} thrown in /var/www/html/navirre.com/htdocs/concrete/vendor/doctrine/orm/lib/Doctrine/ORM/Persisters/Collection/ManyToManyPersister.php on line 28