When using the Aspose.Pdf.dll ( version 25.1 and 25.5) , calling the Aspose.Pdf.Facades.Form.ImportFdf method results in error "unable to cast object of type ‘aspose.pdf.annotations.widgetannotation’ to type ‘aspose.pdf…...pdf"; // Get the form from the document Aspose.Pdf.Facades.Form form...Open the FDF file in a text editor to verify its structure. Ensure...