Fatal error: Uncaught Error: Class "Drupal\quickedit\Plugin\InPlaceEditorBase" not found in /home/www/drupal8/test/core/modules/quickedit/src/Plugin/InPlaceEditor/PlainTextEditor.php:15 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/quickedit/src/Plugin/InPlaceEditor/PlainTextEditor.php on line 15