Deprecated: Non-static method PKPApplication::defineExposedConstant() should not be called statically in /homepages/9/d909200721/htdocs/ojs.didaktik-der-mathematik.de/lib/pkp/classes/core/PKPApplication.inc.php on line 545

Deprecated: Non-static method PKPApplication::getExposedConstants() should not be called statically in /homepages/9/d909200721/htdocs/ojs.didaktik-der-mathematik.de/lib/pkp/classes/core/PKPApplication.inc.php on line 513

DB Error: Duplicate entry '' for key 'sessions_pkey'