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This exception has no message.
java.lang.NullPointerException at java.util.regex.Matcher.quoteReplacement(Matcher.java:598) at hudson.plugins.emailext.plugins.ContentBuilder$Tokenizer.appendReplacement(ContentBuilder.java:195) at hudson.plugins.emailext.plugins.ContentBuilder.replaceTokensWithContent(ContentBuilder.java:96) at hudson.plugins.emailext.plugins.ContentBuilder.transformText(ContentBuilder.java:67) at hudson.plugins.emailext.ExtendedEmailPublisher.setContent(ExtendedEmailPublisher.java:369) at hudson.plugins.emailext.ExtendedEmailPublisher.createMail(ExtendedEmailPublisher.java:274) at hudson.plugins.emailext.ExtendedEmailPublisher.sendMail(ExtendedEmailPublisher.java:220) at hudson.plugins.emailext.ExtendedEmailPublisher._perform(ExtendedEmailPublisher.java:212) at hudson.plugins.emailext.ExtendedEmailPublisher.perform(ExtendedEmailPublisher.java:174) at hudson.tasks.BuildStepMonitor$3.perform(BuildStepMonitor.java:36) at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:682) at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:657) at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:635) at hudson.model.Build$RunnerImpl.cleanUp(Build.java:171) at hudson.model.Run.run(Run.java:1420) at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46) at hudson.model.ResourceController.execute(ResourceController.java:88) at hudson.model.Executor.run(Executor.java:230)