Fatal error: Uncaught Error: Interface "Drupal\Core\Entity\ContentEntityStorageInterface" not found in /home/www/drupal8/test/modules/webform/src/WebformSubmissionStorageInterface.php:14
Stack trace:
#0 {main}
thrown in /home/www/drupal8/test/modules/webform/src/WebformSubmissionStorageInterface.php on line 14