Fatal error: Uncaught Error: Class "Drupal\Core\Field\WidgetBase" not found in /home/qcsvlel/www/core/modules/media_library/src/Plugin/Field/FieldWidget/MediaLibraryWidget.php:45 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/modules/media_library/src/Plugin/Field/FieldWidget/MediaLibraryWidget.php on line 45