java.lang.NullPointerException: null
at org.apache.poi.hssf.record.CFHeaderBase.serialize(CFHeaderBase.java:158)
at org.apache.poi.hssf.record.StandardRecord.serialize(StandardRecord.java:56)
at org.apache.poi.hssf.usermodel.HSSFWorkbook$SheetRecordCollector.serialize(HSSFWorkbook.java:1441)
at org.apache.poi.hssf.usermodel.HSSFWorkbook.getBytes(HSSFWorkbook.java:1491)
at org.apache.poi.hssf.usermodel.HSSFWorkbook.write(HSSFWorkbook.java:1386)
at org.apache.poi.hssf.usermodel.HSSFWorkbook.write(HSSFWorkbook.java:1374)
at org.jxls.transform.poi.PoiTransformer.writeButNotCloseStream(PoiTransformer.java:497)
at org.jxls.transform.poi.PoiTransformer.write(PoiTransformer.java:478)
at com.dingli.fc.excel.jxsl.JxlsBuilder.transform(JxlsBuilder.java:182)