Fatal error: Uncaught Error: Class 'Doctrine\ORM\Persisters\AbstractCollectionPersister' not found in /home/optinadmin/rfl.optin.co.nz/concrete/vendor/doctrine/orm/lib/Doctrine/ORM/Persisters/OneToManyPersister.php:33 Stack trace: #0 {main} thrown in /home/optinadmin/rfl.optin.co.nz/concrete/vendor/doctrine/orm/lib/Doctrine/ORM/Persisters/OneToManyPersister.php on line 33