Fatal error: Class Kufer\Web\Classes\Api\SearchRestriction\SearchRestrictionKatBeginndatIntervallFilter contains 1 abstract method and must therefore be declared abstract or implement the remaining methods (Kufer\Web\Classes\Api\SearchRestriction\SearchRestriction::cleanFilterKriterium) in /www/htdocs/w0207743/koeln.site-testing.de/public/fileadmin/kuferweb/classes/api/sucheinschraenkung/SearchRestrictionKatBeginndatIntervallFilter.php on line 10