You must either specify a string src or a File object.
E_RECOVERABLE_ERROR Error in file "/kunden/179933_49716/rp-hosting/1009/2009/typo3/typo3conf/ext/ncn_productdatabase/Classes/Controller/ProductController.php" at line 74: Argument 1 passed to Ncn\NcnProductdatabase\Controller\ProductController::showAction() must be an instance of Ncn\NcnProductdatabase\Domain\Model\Product, null given