Fatal error: Uncaught Error: Call to undefined function add_filter() in /home/polirqqx/shortstoriesbyai.com/wp-content/plugins/gravityplus-gfutility/tools/send-notification-entry-update.php:45 Stack trace: #0 /home/polirqqx/shortstoriesbyai.com/wp-content/plugins/gravityplus-gfutility/tools/send-notification-entry-update.php(30): GFPGFU_Send_Notification_Entry_Update->add_notification_event() #1 /home/polirqqx/shortstoriesbyai.com/wp-content/plugins/gravityplus-gfutility/tools/send-notification-entry-update.php(201): GFPGFU_Send_Notification_Entry_Update->__construct() #2 {main} thrown in /home/polirqqx/shortstoriesbyai.com/wp-content/plugins/gravityplus-gfutility/tools/send-notification-entry-update.php on line 45