Fatal error: Uncaught Error: Class 'PKP\components\forms\FormComponent' not found in /var/www/html/lib/pkp/classes/components/forms/context/PKPAppearanceSetupForm.inc.php:23 Stack trace: #0 {main} thrown in /var/www/html/lib/pkp/classes/components/forms/context/PKPAppearanceSetupForm.inc.php on line 23