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java.lang.NullPointerException at com.lowagie.text.pdf.PdfStamperImp.eliminateAcroformObjects(Unknown Source) at com.lowagie.text.pdf.PdfStamperImp.flatFields(Unknown Source) at com.lowagie.text.pdf.PdfStamperImp.close(Unknown Source) at com.lowagie.text.pdf.PdfStamper.close(Unknown Source)