Fatal error: Uncaught Error: Call to undefined function add_filter() in /home/frassati/public_html/wp-content/plugins/cornerstone/includes/integration/Api/DashboardSettings.php:3 Stack trace: #0 /home/frassati/public_html/wp-content/plugins/cornerstone/includes/integration/Api/ApiIntegration.php(3): require_once() #1 {main} thrown in /home/frassati/public_html/wp-content/plugins/cornerstone/includes/integration/Api/DashboardSettings.php on line 3