Fatal error: Uncaught Error: Undefined constant "PKP\core\INDEX_FILE_LOCATION" in /var/www/html/lib/pkp/classes/core/Core.php:42 Stack trace: #0 /var/www/html/lib/pkp/classes/core/Core.php(32): PKP\core\Core::getBaseDir() #1 {main} thrown in /var/www/html/lib/pkp/classes/core/Core.php on line 42