Fatal error: Uncaught Error: Class 'Drupal\views\Plugin\views\sort\SortPluginBase' not found in /var/www/html/tmp/contrib/flag/src/Plugin/views/sort/FlagViewsSortFlagged.php:12 Stack trace: #0 {main} thrown in /var/www/html/tmp/contrib/flag/src/Plugin/views/sort/FlagViewsSortFlagged.php on line 12