Fatal error: Uncaught Error: Non-static method PKPApplication::defineExposedConstant() cannot be called statically in /home/ejurnal/public_html/lib/pkp/classes/core/PKPApplication.inc.php:545 Stack trace: #0 /home/ejurnal/public_html/lib/pkp/classes/core/PKPApplication.inc.php(17): define_exposed() #1 /home/ejurnal/public_html/lib/pkp/includes/functions.inc.php(28): include_once('...') #2 /home/ejurnal/public_html/classes/core/Application.inc.php(19): import() #3 /home/ejurnal/public_html/lib/pkp/includes/functions.inc.php(28): include_once('...') #4 /home/ejurnal/public_html/lib/pkp/includes/bootstrap.inc.php(55): import() #5 /home/ejurnal/public_html/index.php(60): require('...') #6 {main} thrown in /home/ejurnal/public_html/lib/pkp/classes/core/PKPApplication.inc.php on line 545