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