Fatal error: Uncaught Error: Class "Drupal\webform\Plugin\WebformElement\Checkboxes" not found in /home/www/drupal8/test/modules/webform/src/Plugin/WebformElement/WebformCheckboxesOther.php:18
Stack trace:
#0 {main}
thrown in /home/www/drupal8/test/modules/webform/src/Plugin/WebformElement/WebformCheckboxesOther.php on line 18