Fatal error: Uncaught Error: Class "Facebook\GraphNodes\GraphNode" not found in /opt/app-root/src/wp-content/plugins/xyz-wp-smap/api/Facebook/GraphNodes/GraphEvent.php:31 Stack trace: #0 {main} thrown in /opt/app-root/src/wp-content/plugins/xyz-wp-smap/api/Facebook/GraphNodes/GraphEvent.php on line 31