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java.lang.NullPointerException: null	at org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:162)	at org.apache.poi.ss.usermodel.WorkbookFactory.create(WorkbookFactory.java:143)	at org.jxls.transform.poi.PoiTransformer.createTransformer(PoiTransformer.java:47)	at org.jxls.transform.poi.PoiTransformer.createTransformer(PoiTransformer.java:40)	at com.sri.xlsreport.Demo1.main(Demo1.java:37)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.jxls.util.TransformerFactory.createTransformer(TransformerFactory.java:35)	at org.jxls.util.JxlsHelper.createTransformer(JxlsHelper.java:187)	at org.jxls.util.JxlsHelper.processTemplate(JxlsHelper.java:88)	at com.sri.xlsreport.Demo1.ObjectCollectionDemo(Demo1.java:49)	at com.sri.xlsreport.Demo1.main(Demo1.java:37)