Fatal error: Uncaught Error: Interface 'AC\Registerable' not found in C:\xampp\htdocs\wp-content\plugins\admin-columns-pro\addons\gravityforms\classes\GravityForms.php:19 Stack trace: #0 {main} thrown in C:\xampp\htdocs\wp-content\plugins\admin-columns-pro\addons\gravityforms\classes\GravityForms.php on line 19