Error: Type 'DecoderCallback' not found

Hi, i have an app with no custom code. It was working fine on both iOS and Android however i have just added a few new features (added a carousel to a page, enabled anonymous authentication and push notifications - both of these just in the Flutterflow settings, no custom code).

Now when i try to compile in XCode i get the following error...

error: ../../../../.pub-cache/hosted/pub.dev/pdfx-2.3.0/lib/src/viewer/pdf_page_image_provider.dart:24:55: Error: Type 'DecoderCallback' not found.

I am pulling my hair out on this one, I have googled the error and not really getting much useful. (Note: i have a PDF viewer in the app but I have not touched this page since i last had it working).

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