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This exception has no message.
java.lang.NullPointerException at org.jenkinsci.main.modules.instance_identity.InstanceIdentity.get( at jenkins.plugins.mailer.tasks.MimeMessageBuilder.setJenkinsInstanceIdent( at jenkins.plugins.mailer.tasks.MimeMessageBuilder.buildMimeMessage( at hudson.tasks.MailSender.createEmptyMail( at hudson.tasks.MailSender.createBackToNormalMail( at hudson.tasks.MailSender.createMail( at at hudson.tasks.Mailer.perform( at hudson.tasks.BuildStepCompatibilityLayer.perform( at hudson.tasks.BuildStepMonitor$1.perform( at hudson.model.AbstractBuild$AbstractBuildExecution.perform( at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps( at hudson.model.Build$BuildExecution.post2( at hudson.model.AbstractBuild$ at hudson.model.Run.execute( at at hudson.model.ResourceController.execute( at