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java.lang.NullPointerException: 	at com.itextpdf.kernel.pdf.tagging.ParentTreeHandler.registerMcr(	at com.itextpdf.kernel.pdf.tagging.ParentTreeHandler.registerAllMcrs(	at com.itextpdf.kernel.pdf.tagging.ParentTreeHandler.(	at com.itextpdf.kernel.pdf.tagging.PdfStructTreeRoot.(	at	at com.itextpdf.kernel.pdf.PdfDocument.(