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java.lang.NullPointerException: 	at org.apache.poi.xwpf.converter.core.MasterPageManager.visitHeadersFooters(MasterPageManager.java:198)	at org.apache.poi.xwpf.converter.core.MasterPageManager.addSection(MasterPageManager.java:178)	at org.apache.poi.xwpf.converter.core.MasterPageManager.compute(MasterPageManager.java:125)	at org.apache.poi.xwpf.converter.core.MasterPageManager.initialize(MasterPageManager.java:95)	at org.apache.poi.xwpf.converter.core.XWPFDocumentVisitor.visitBodyElements(XWPFDocumentVisitor.java:226)	at org.apache.poi.xwpf.converter.core.XWPFDocumentVisitor.start(XWPFDocumentVisitor.java:193)	at org.apache.poi.xwpf.converter.pdf.PdfConverter.doConvert(PdfConverter.java:55)	at org.apache.poi.xwpf.converter.pdf.PdfConverter.doConvert(PdfConverter.java:37)	at org.apache.poi.xwpf.converter.core.AbstractXWPFConverter.convert(AbstractXWPFConverter.java:45)	at com.namedropper.integrationtest.Docx2Pdf.main(Docx2Pdf.java:23)