Hey Tillmoss, I had the same error as you, I had copied some code from Hacking With Swift that I think was out of date. I then found the solution thanks to a YouTube video by the user Jared Davidson. It won't allow me to link to his video but the solution is to do the following : import CoreImage.CIFilterBuiltins let context = CIContext() let filter = CIFilter.qrCodeGenerator() ... private func generateQRCode(from string: String) - UIImage {         let data = Data(string.utf8)         filter.setValue(data, forKey: "inputMessage")         if let qrCodeImage = filter.outputImage {             if let qrCodeCGImage = context.createCGImage(qrCodeImage, from: qrCodeImage.extent) {                 return UIImage(cgImage: qrCodeCGImage)             }         }         return UIImage(systemName: "xmark") ?? UIImage()     }

I am trying to achieve something similar and am too much of a newbie with generics and associated types to understand what is going on. Definitely following this.