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java.lang.NullPointerException: 	at org.apache.poi.xwpf.converter.core.utils.XWPFTableUtil.getGridColList(XWPFTableUtil.java:166)	at org.apache.poi.xwpf.converter.core.utils.XWPFTableUtil.computeColWidths(XWPFTableUtil.java:99)	at org.apache.poi.xwpf.converter.core.XWPFDocumentVisitor.visitTable(XWPFDocumentVisitor.java:827)	at org.apache.poi.xwpf.converter.core.XWPFDocumentVisitor.visitBodyElements(XWPFDocumentVisitor.java:245)	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 pe.edu.rpanaque.docxsunarppdf.ConvertDocx1.main(ConvertDocx1.java:30)