Fatal error: Uncaught Error: Class "PKP\core\PKPBaseController" not found in /var/www/html/lib/pkp/api/v1/emailTemplates/PKPEmailTemplateController.php:35 Stack trace: #0 {main} thrown in /var/www/html/lib/pkp/api/v1/emailTemplates/PKPEmailTemplateController.php on line 35