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java.lang.NullPointerException: null	at	at	at org.jxls.transform.poi.PoiTransformer.createTransformer(	at org.jxls.transform.poi.PoiTransformer.createTransformer(	at com.sri.xlsreport.Demo1.main(	at sun.reflect.NativeMethodAccessorImpl.invoke(	at sun.reflect.DelegatingMethodAccessorImpl.invoke(	at java.lang.reflect.Method.invoke(	at org.jxls.util.TransformerFactory.createTransformer(	at org.jxls.util.JxlsHelper.createTransformer(	at org.jxls.util.JxlsHelper.processTemplate(	at com.sri.xlsreport.Demo1.ObjectCollectionDemo(	at com.sri.xlsreport.Demo1.main(