Fatal error: Uncaught Error: Class "Drupal\Core\Plugin\DefaultPluginManager" not found in /home/fnbrshareacopy/public_html/modules/contrib/search_api_solr/src/SolrConnector/SolrConnectorPluginManager.php:18 Stack trace: #0 {main} thrown in /home/fnbrshareacopy/public_html/modules/contrib/search_api_solr/src/SolrConnector/SolrConnectorPluginManager.php on line 18