Fatal error: Declaration of SchultzHencke\Util\Markdom\ModelHandler::onHeadingBlockBegin(int $level): void must be compatible with Markdom\Model\Handler\ModelHandler::onHeadingBlockBegin($level) in /homepages/8/d336920871/htdocs/2017.shh.de/lib/Util/Markdom/ModelHandler.php on line 14