Hello,

I followed this tutorial: https://www.syncfusion.com/kb/11963/how-to-add-watermark-to-pdf-file-in-flutter

But it only works on this example, using exactly the same code, it doesn't work for other PDF, I keep getting this error:

type '_PdfReferenceHolder' is not a subtype of type '_PdfArray' in type cast

Does anyone else have same problem? Thank you!