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java.lang.NullPointerException: 	at hudson.plugins.emailext.ExtendedEmailPublisher.createMail(ExtendedEmailPublisher.java:346)	at hudson.plugins.emailext.ExtendedEmailPublisher.sendMail(ExtendedEmailPublisher.java:251)	at hudson.plugins.emailext.ExtendedEmailPublisher._perform(ExtendedEmailPublisher.java:243)	at hudson.plugins.emailext.ExtendedEmailPublisher.perform(ExtendedEmailPublisher.java:203)	at hudson.tasks.BuildStepMonitor$3.perform(BuildStepMonitor.java:36)	at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:697)	at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:672)	at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:650)	at hudson.model.Build$RunnerImpl.cleanUp(Build.java:171)	at hudson.model.Run.run(Run.java:1448)	at hudson.matrix.MatrixRun.run(MatrixRun.java:146)	at hudson.model.ResourceController.execute(ResourceController.java:88)	at hudson.model.Executor.run(Executor.java:238)