Fatal error: Uncaught Error: Class "Drupal\serialization\Normalizer\EntityNormalizer" not found in /home/qcsvlel/www/core/modules/serialization/src/Normalizer/ContentEntityNormalizer.php:11 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/modules/serialization/src/Normalizer/ContentEntityNormalizer.php on line 11