Fatal error: Uncaught Error: Class "Drupal\jsonapi\Normalizer\EntityDenormalizerBase" not found in /home/qcsvlel/www/core/modules/jsonapi/src/Normalizer/ContentEntityDenormalizer.php:18 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/modules/jsonapi/src/Normalizer/ContentEntityDenormalizer.php on line 18