Fatal error: Uncaught Error: Class "PKP\user\form\RegistrationForm" not found in /home/u1655366/public_html/journal.literasantri.com/lib/pkp/pages/user/RegistrationHandler.php:62 Stack trace: #0 [internal function]: PKP\pages\user\RegistrationHandler->register() #1 /home/u1655366/public_html/journal.literasantri.com/lib/pkp/classes/core/PKPRouter.php(334): call_user_func() #2 /home/u1655366/public_html/journal.literasantri.com/lib/pkp/classes/core/PKPPageRouter.php(278): PKP\core\PKPRouter->_authorizeInitializeAndCallRequest() #3 /home/u1655366/public_html/journal.literasantri.com/lib/pkp/classes/core/Dispatcher.php(165): PKP\core\PKPPageRouter->route() #4 /home/u1655366/public_html/journal.literasantri.com/lib/pkp/classes/core/PKPApplication.php(395): PKP\core\Dispatcher->dispatch() #5 /home/u1655366/public_html/journal.literasantri.com/index.php(21): PKP\core\PKPApplication->execute() #6 {main} thrown in /home/u1655366/public_html/journal.literasantri.com/lib/pkp/pages/user/RegistrationHandler.php on line 62