Fatal error: Uncaught Error: Class "Sprain\SwissQrBill\PaymentPart\Output\DisplayOptions" not found in /var/www/qr-ch.lotzapp.work/example/HtmlOutput/html-example.php:18 Stack trace: #0 {main} thrown in /var/www/qr-ch.lotzapp.work/example/HtmlOutput/html-example.php on line 18