Fatal error: Uncaught Error: Class "Drupal\Core\Controller\ControllerBase" not found in /home/quitpathshareaco/public_html/New/vendor/drupal/core/modules/block/src/Controller/BlockAddController.php:10 Stack trace: #0 {main} thrown in /home/quitpathshareaco/public_html/New/vendor/drupal/core/modules/block/src/Controller/BlockAddController.php on line 10