Fatal error: Uncaught Error: Interface "ilObjectCustomIconPresenter" not found in /var/www/html/ilias/components/ILIAS/ILIASObject/classes/Properties/AdditionalProperties/Icon/class.ilObjectReferenceCustomIconPresenter.php:21 Stack trace: #0 {main} thrown in /var/www/html/ilias/components/ILIAS/ILIASObject/classes/Properties/AdditionalProperties/Icon/class.ilObjectReferenceCustomIconPresenter.php on line 21