Fatal error: Uncaught Error: Class "Drupal\search_api\Backend\BackendPluginBase" not found in /home/fnbrshareacopy/public_html/modules/contrib/search_api_solr/src/Plugin/search_api/backend/SearchApiSolrBackend.php:113 Stack trace: #0 {main} thrown in /home/fnbrshareacopy/public_html/modules/contrib/search_api_solr/src/Plugin/search_api/backend/SearchApiSolrBackend.php on line 113