Fatal error: Uncaught Error: Class "Drupal\Core\Plugin\DefaultPluginManager" not found in /home/qcsvlel/www/core/modules/ckeditor5/src/Plugin/CKEditor5PluginManager.php:35 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/modules/ckeditor5/src/Plugin/CKEditor5PluginManager.php on line 35