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java.lang.NullPointerException: 	at java.util.regex.Matcher.quoteReplacement(Matcher.java:598)	at hudson.plugins.emailext.plugins.ContentBuilder$Tokenizer.appendReplacement(ContentBuilder.java:211)	at hudson.plugins.emailext.plugins.ContentBuilder.replaceTokensWithContent(ContentBuilder.java:112)	at hudson.plugins.emailext.plugins.ContentBuilder.transformText(ContentBuilder.java:82)	at hudson.plugins.emailext.ExtendedEmailPublisher.getContent(ExtendedEmailPublisher.java:482)	at hudson.plugins.emailext.ExtendedEmailPublisher.createMail(ExtendedEmailPublisher.java:314)	at hudson.plugins.emailext.ExtendedEmailPublisher.sendMail(ExtendedEmailPublisher.java:259)	at hudson.plugins.emailext.ExtendedEmailPublisher._perform(ExtendedEmailPublisher.java:251)	at hudson.plugins.emailext.ExtendedEmailPublisher.perform(ExtendedEmailPublisher.java:211)	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.model.FreeStyleBuild.run(FreeStyleBuild.java:46)	at hudson.model.ResourceController.execute(ResourceController.java:88)	at hudson.model.Executor.run(Executor.java:238)