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java.lang.InstantiationError: testing	at sun.reflect.GeneratedSerializationConstructorAccessor28.newInstance(sum.sc)	at java.lang.reflect.Constructor.newInstance(sum.sc:419)	at com.thoughtworks.xstream.converters.reflection.Sun14ReflectionProvider.newInstance(sum.sc:71)	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.instantiateNewInstance(sum.sc:424)	at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(sum.sc:229)	at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(sum.sc:68)	at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(sum.sc:61)	at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(sum.sc:62)	at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(sum.sc:46)	at com.thoughtworks.xstream.core.TreeUnmarshaller.start(sum.sc:130)	at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(sum.sc:28)	at com.thoughtworks.xstream.XStream.unmarshal(sum.sc:1054)	at com.thoughtworks.xstream.XStream.unmarshal(sum.sc:1038)	at com.thoughtworks.xstream.XStream.fromXML(sum.sc:909)	at com.thoughtworks.xstream.XStream.fromXML(sum.sc:900)