Fatal error: Uncaught Error: Class 'Drupal\Core\Config\Entity\ConfigEntityBase' not found in /var/www/html/tmp/contrib/cer/src/Entity/CorrespondingReference.php:48 Stack trace: #0 {main} thrown in /var/www/html/tmp/contrib/cer/src/Entity/CorrespondingReference.php on line 48