java.lang.NullPointerException

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    • java.lang.NullPointerException at org.apache.poi.util.PackageHelper.copy(PackageHelper.java:129) at org.apache.poi.util.PackageHelper.clone(PackageHelper.java:87) at org.apache.poi.util.PackageHelper.clone(PackageHelper.java:44) at org.apache.poi.POIXMLDocument.ensureWriteAccess(POIXMLDocument.java:185) at org.apache.poi.xssf.usermodel.XSSFWorkbook.<init>(XSSFWorkbook.java:169) at org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:63)
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