Fatal error: Uncaught Error: Class "Drupal\Core\Entity\EntityForm" not found in /home/www/drupal8/test/core/modules/responsive_image/src/ResponsiveImageStyleForm.php:15 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/responsive_image/src/ResponsiveImageStyleForm.php on line 15