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java.lang.NullPointerException: 	at hudson.plugins.emailext.ExtendedEmailPublisher.createMail(ExtendedEmailPublisher.java:538)	at hudson.plugins.emailext.ExtendedEmailPublisher.sendMail(ExtendedEmailPublisher.java:304)	at hudson.plugins.emailext.ExtendedEmailPublisher._perform(ExtendedEmailPublisher.java:296)	at hudson.plugins.emailext.ExtendedEmailPublisher.perform(ExtendedEmailPublisher.java:256)	at hudson.tasks.BuildStepMonitor$3.perform(BuildStepMonitor.java:36)	at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:798)	at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:770)	at hudson.model.Build$BuildExecution.cleanUp(Build.java:192)	at hudson.model.Run.execute(Run.java:1620)	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)	at hudson.model.ResourceController.execute(ResourceController.java:88)	at hudson.model.Executor.run(Executor.java:237)