Fatal error: Uncaught Error: Class "Drupal\Core\Menu\LocalTaskDefault" not found in /home/www/drupal8/test/core/modules/comment/src/Plugin/Menu/LocalTask/UnapprovedComments.php:15 Stack trace: #0 {main} thrown in /home/www/drupal8/test/core/modules/comment/src/Plugin/Menu/LocalTask/UnapprovedComments.php on line 15