Fatal error: Uncaught Error: Class "Drupal\serialization\Normalizer\FieldNormalizer" not found in /home/www/drupal8/test/core/modules/hal/src/Normalizer/FieldNormalizer.php:11
Stack trace:
#0 {main}
thrown in /home/www/drupal8/test/core/modules/hal/src/Normalizer/FieldNormalizer.php on line 11