Fatal error: Uncaught Error: Call to undefined function add_filter() in /home/clmepl5/public_html/web/app/plugins/gravityview/includes/class-gravityview-entry-notes.php:28 Stack trace: #0 /home/clmepl5/public_html/web/app/plugins/gravityview/includes/class-gravityview-entry-notes.php(21): GravityView_Entry_Notes->add_hooks() #1 /home/clmepl5/public_html/web/app/plugins/gravityview/includes/class-gravityview-entry-notes.php(182): GravityView_Entry_Notes->__construct() #2 {main} thrown in /home/clmepl5/public_html/web/app/plugins/gravityview/includes/class-gravityview-entry-notes.php on line 28