Fatal error: Uncaught Error: Class "Drupal\Core\Controller\ControllerBase" not found in /home/fnbrshareacopy/public_html/modules/contrib/search_api_solr/src/Controller/SolrConfigSetController.php:28 Stack trace: #0 {main} thrown in /home/fnbrshareacopy/public_html/modules/contrib/search_api_solr/src/Controller/SolrConfigSetController.php on line 28