java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.zkoss.zss.api.impl.RangeImpl.getBook(RangeImpl.java:317)
at org.zkoss.zss.api.SheetOperationUtil$2.run(SheetOperationUtil.java:348)
at org.zkoss.zss.api.impl.RangeImpl.sync(RangeImpl.java:263)
at org.zkoss.zss.api.SheetOperationUtil.createSheet(SheetOperationUtil.java:346)

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