Fatal error: Uncaught Error: Call to undefined function add_filter() in /home/adaptyo3/public_html/wp-content/plugins/wp-sync-db/compatibility/wp-sync-db-compatibility.php:30 Stack trace: #0 {main} thrown in /home/adaptyo3/public_html/wp-content/plugins/wp-sync-db/compatibility/wp-sync-db-compatibility.php on line 30