Fatal error: Uncaught Error: Class 'Drupal\serialization\Normalizer\NormalizerBase' not found in /var/www/html/tmp/contrib/simple_oauth/src/Normalizer/TokenEntityNormalizer.php:8 Stack trace: #0 {main} thrown in /var/www/html/tmp/contrib/simple_oauth/src/Normalizer/TokenEntityNormalizer.php on line 8