Fatal error: Uncaught Error: Class "Drupal\Core\Render\Element\Table" not found in /home/www/drupal8/test/modules/webform/src/Element/WebformTableSelectSort.php:16 Stack trace: #0 {main} thrown in /home/www/drupal8/test/modules/webform/src/Element/WebformTableSelectSort.php on line 16