Fatal error: Uncaught Error: Call to undefined function add_filter() in /home/polirqqx/shortstoriesbyai.com/wp-content/plugins/gravityplus-gfutility/tools/record-sent-notifications.php:31 Stack trace: #0 /home/polirqqx/shortstoriesbyai.com/wp-content/plugins/gravityplus-gfutility/tools/record-sent-notifications.php(198): GFPGFU_Record_Sent_Notifications->run() #1 {main} thrown in /home/polirqqx/shortstoriesbyai.com/wp-content/plugins/gravityplus-gfutility/tools/record-sent-notifications.php on line 31