Fatal error: Uncaught Error: Call to undefined function Themeco\Cornerstone\API\add_action() in /home/waterengineering/public_html/wp-content/plugins/cornerstone/includes/integration/Api/ApiLooper.php:10 Stack trace: #0 {main} thrown in /home/waterengineering/public_html/wp-content/plugins/cornerstone/includes/integration/Api/ApiLooper.php on line 10