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java.lang.NullPointerException: 	at java.util.TreeMap.put(TreeMap.java:541)	at hudson.plugins.javatest_report.TestCollection.add(TestCollection.java:84)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)	at java.lang.reflect.Method.invoke(Method.java:597)	at org.apache.commons.beanutils.MethodUtils.invokeMethod(MethodUtils.java:281)	at org.apache.commons.digester.SetNextRule.end(SetNextRule.java:216)	at org.apache.commons.digester.Rule.end(Rule.java:230)	at org.apache.commons.digester.Digester.endElement(Digester.java:1130)	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(AbstractSAXParser.java:601)	at com.sun.org.apache.xerces.internal.parsers.AbstractXMLDocumentParser.emptyElement(AbstractXMLDocumentParser.java:180)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanStartElement(XMLDocumentFragmentScannerImpl.java:1343)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2755)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:511)	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:808)	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)	at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:119)	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205)	at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)	at org.apache.commons.digester.Digester.parse(Digester.java:1631)	at hudson.plugins.javatest_report.Report.add(Report.java:90)	at hudson.plugins.javatest_report.JavaTestAction.load(JavaTestAction.java:109)	at hudson.plugins.javatest_report.JavaTestAction.(JavaTestAction.java:53)	at hudson.plugins.javatest_report.JavaTestReportPublisher.perform(JavaTestReportPublisher.java:149)	at hudson.tasks.BuildStepMonitor$3.perform(BuildStepMonitor.java:36)	at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:601)	at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:580)	at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:558)	at hudson.model.Build$RunnerImpl.post2(Build.java:158)	at hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:528)	at hudson.model.Run.run(Run.java:1264)	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)	at hudson.model.ResourceController.execute(ResourceController.java:88)	at hudson.model.Executor.run(Executor.java:124)