Fatal error: Uncaught Error: Class "Drupal\Core\Field\WidgetBase" not found in /home/fnbrshareacopy/public_html/modules/contrib/markup/src/Plugin/Field/FieldWidget/MarkupWidget.php:20 Stack trace: #0 {main} thrown in /home/fnbrshareacopy/public_html/modules/contrib/markup/src/Plugin/Field/FieldWidget/MarkupWidget.php on line 20