Fatal error: Uncaught Error: Class 'ACF_Admin_Internal_Post_Type' not found in C:\xampp\htdocs\wp-content\plugins\advanced-custom-fields\includes\admin\post-types\admin-field-group.php:18 Stack trace: #0 {main} thrown in C:\xampp\htdocs\wp-content\plugins\advanced-custom-fields\includes\admin\post-types\admin-field-group.php on line 18