Debug
TYPO3\CMS\Extbase\Mvc\Controller\Exception\RequiredArgumentMissingExceptionprototypeobject
   message => protected'Required argument "product" is not set for Dia\DiaHuebner\Controller\Product
      Controller->show.
' (93 chars) code => protected1298012500 (integer) file => protected'/var/www/vhosts/huebner-giessen.com/huebner-giessen.com/vendor/typo3/cms/typ
      o3/sysext/extbase/Classes/Mvc/Controller/AbstractController.php
' (139 chars) line => protected425 (integer)