We have been using OJS software (version 2.x) to manage
journal site -
http://rebcee.eu/index.php/REB/index
But the page seems to be unavailable now, it reads only -
Deprecated: Non-static method PKPApplication::defineExposedConstant() should not be called statically in /data02/virt40340/domeenid/www.rebcee.eu/htdocs/lib/pkp/classes/core/PKPApplication.inc.php on line 556
Deprecated: Non-static method PKPApplication::getExposedConstants() should not be called statically in /data02/virt40340/domeenid/www.rebcee.eu/htdocs/lib/pkp/classes/core/PKPApplication.inc.php on line 524
What does that mean and what to do?