Fatal error: Uncaught Error: Class "Drupal\Core\Field\Plugin\Field\FieldFormatter\EntityReferenceFormatterBase" not found in /home/qcsvlel/www/core/modules/user/src/Plugin/Field/FieldFormatter/AuthorFormatter.php:23 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/modules/user/src/Plugin/Field/FieldFormatter/AuthorFormatter.php on line 23