Fatal error: Uncaught Error: Class "Drupal\serialization\Encoder\JsonEncoder" not found in /home/qcsvlel/www/core/modules/jsonapi/src/Encoder/JsonEncoder.php:16 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/modules/jsonapi/src/Encoder/JsonEncoder.php on line 16