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java.lang.NullPointerException: 	at net.masterthought.cucumber.util.Util.toValidFileName(Util.java:50)	at net.masterthought.cucumber.json.Feature.calculateReportFileName(Feature.java:173)	at net.masterthought.cucumber.json.Feature.setMetaData(Feature.java:153)	at net.masterthought.cucumber.ReportParser.setMetadata(ReportParser.java:91)	at net.masterthought.cucumber.ReportParser.parseJsonResults(ReportParser.java:61)	at net.masterthought.cucumber.ReportBuilder.generateReports(ReportBuilder.java:56)	at net.masterthought.jenkins.CucumberReportPublisher.generateReport(CucumberReportPublisher.java:110)	at net.masterthought.jenkins.CucumberReportPublisher.perform(CucumberReportPublisher.java:62)	at hudson.tasks.BuildStepCompatibilityLayer.perform(BuildStepCompatibilityLayer.java:78)	at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)	at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:779)	at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:720)	at hudson.model.Build$BuildExecution.post2(Build.java:185)	at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:665)	at hudson.model.Run.execute(Run.java:1745)	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)	at hudson.model.ResourceController.execute(ResourceController.java:98)	at hudson.model.Executor.run(Executor.java:404)