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java.lang.NullPointerException: 	at com.thoughtworks.xstream.io.xml.PrettyPrintWriter.writeAttributeValue(PrettyPrintWriter.java:85)	at com.thoughtworks.xstream.io.xml.PrettyPrintWriter.addAttribute(PrettyPrintWriter.java:80)	at com.thoughtworks.xstream.io.WriterWrapper.addAttribute(WriterWrapper.java:25)	at org.apache.jmeter.save.converters.SampleResultConverter.setAttributes(SampleResultConverter.java:225)	at org.apache.jmeter.protocol.http.util.HTTPResultConverter.marshal(HTTPResultConverter.java:76)	at com.thoughtworks.xstream.core.ReferenceByXPathMarshaller.convertAnother(ReferenceByXPathMarshaller.java:36)	at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.writeItem(AbstractCollectionConverter.java:68)	at org.apache.jmeter.save.converters.SampleResultConverter.saveSubResults(SampleResultConverter.java:180)	at org.apache.jmeter.protocol.http.util.HTTPResultConverter.marshal(HTTPResultConverter.java:78)	at com.thoughtworks.xstream.core.ReferenceByXPathMarshaller.convertAnother(ReferenceByXPathMarshaller.java:36)	at com.thoughtworks.xstream.core.TreeMarshaller.start(TreeMarshaller.java:46)	at com.thoughtworks.xstream.core.ReferenceByXPathMarshallingStrategy.marshal(ReferenceByXPathMarshallingStrategy.java:17)	at com.thoughtworks.xstream.XStream.marshal(XStream.java:461)	at com.thoughtworks.xstream.XStream.marshal(XStream.java:451)	at com.thoughtworks.xstream.XStream.toXML(XStream.java:443)	at org.apache.jmeter.save.SaveService.saveSampleResult(SaveService.java:231)	at org.apache.jmeter.reporters.ResultCollector.recordResult(ResultCollector.java:412)	at org.apache.jmeter.reporters.ResultCollector.sampleOccurred(ResultCollector.java:390)	at org.apache.jmeter.threads.ListenerNotifier.notifyListeners(ListenerNotifier.java:225)	at org.apache.jmeter.threads.JMeterThread.notifyListeners(JMeterThread.java:467)	at org.apache.jmeter.threads.JMeterThread.run(JMeterThread.java:258)	at java.lang.Thread.run(Thread.java:595)