Fatal error: Uncaught Error: Class "Drupal\text\Plugin\Field\FieldWidget\TextareaWidget" not found in /home/www/drupal8/test/core/modules/text/src/Plugin/Field/FieldWidget/TextareaWithSummaryWidget.php:20 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/text/src/Plugin/Field/FieldWidget/TextareaWithSummaryWidget.php on line 20