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This exception has no message.
java.lang.NullPointerException at org.jenkinsci.main.modules.instance_identity.InstanceIdentity.get(InstanceIdentity.java:126) at jenkins.plugins.mailer.tasks.MimeMessageBuilder.setJenkinsInstanceIdent(MimeMessageBuilder.java:184) at jenkins.plugins.mailer.tasks.MimeMessageBuilder.buildMimeMessage(MimeMessageBuilder.java:162) at hudson.tasks.MailSender.createEmptyMail(MailSender.java:391) at hudson.tasks.MailSender.createBackToNormalMail(MailSender.java:201) at hudson.tasks.MailSender.createMail(MailSender.java:192) at hudson.tasks.MailSender.run(MailSender.java:107) at hudson.tasks.Mailer.perform(Mailer.java:141) at hudson.tasks.BuildStepCompatibilityLayer.perform(BuildStepCompatibilityLayer.java:74) at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20) at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:770) at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:734) at hudson.model.Build$BuildExecution.post2(Build.java:183) at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:683) at hudson.model.Run.execute(Run.java:1743) at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43) at hudson.model.ResourceController.execute(ResourceController.java:89) at hudson.model.Executor.run(Executor.java:240)