Fatal error: Uncaught Error: Class "Drupal\Core\Display\VariantBase" not found in /home/qcsvlel/www/core/modules/block/src/Plugin/DisplayVariant/BlockPageVariant.php:33 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/modules/block/src/Plugin/DisplayVariant/BlockPageVariant.php on line 33