java.lang.reflect.InvocationTargetException: null

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java.lang.NullPointerException: null
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(

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