Fatal error: Uncaught Error: Class "WPML_Hierarchy_Sync" not found in /home/oxygenco/prod/wordpress/wp-content/plugins/sitepress-multilingual-cms/inc/post-translation/wpml-post-hierarchy-sync.class.php:3 Stack trace: #0 {main} thrown in /home/oxygenco/prod/wordpress/wp-content/plugins/sitepress-multilingual-cms/inc/post-translation/wpml-post-hierarchy-sync.class.php on line 3