Fatal error: Uncaught Error: Class "Drupal\Core\Block\BlockBase" not found in /home/qcsvlel/www/core/lib/Drupal/Core/Menu/Plugin/Block/LocalActionsBlock.php:20 Stack trace: #0 {main} thrown in /home/qcsvlel/www/core/lib/Drupal/Core/Menu/Plugin/Block/LocalActionsBlock.php on line 20