Fatal error: Uncaught Error: Call to undefined function add_filter() in /home/clmepl5/public_html/web/app/plugins/gravityview/includes/class-gravityview-merge-tags.php:23 Stack trace: #0 /home/clmepl5/public_html/web/app/plugins/gravityview/includes/class-gravityview-merge-tags.php(13): GravityView_Merge_Tags->add_hooks() #1 /home/clmepl5/public_html/web/app/plugins/gravityview/includes/class-gravityview-merge-tags.php(672): GravityView_Merge_Tags->__construct() #2 {main} thrown in /home/clmepl5/public_html/web/app/plugins/gravityview/includes/class-gravityview-merge-tags.php on line 23