Fatal error: Uncaught Error: Class "Drupal\Core\Render\Element\Table" not found in /home/www/drupal8/test/core/modules/field_ui/src/Element/FieldUiTable.php:14 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/field_ui/src/Element/FieldUiTable.php on line 14