Fatal error: Uncaught Error: Class "horstoeko\zugferd\ZugferdDocument" not found in /var/www/html/src/vendor/horstoeko/zugferd/src/ZugferdDocumentBuilder.php:29 Stack trace: #0 {main} thrown in /var/www/html/src/vendor/horstoeko/zugferd/src/ZugferdDocumentBuilder.php on line 29