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java.lang.NullPointerException: 	at hudson.plugins.emailext.plugins.trigger.AbstractScriptTrigger.createEngine(AbstractScriptTrigger.java:81)	at hudson.plugins.emailext.plugins.trigger.AbstractScriptTrigger.trigger(AbstractScriptTrigger.java:56)	at hudson.plugins.emailext.ExtendedEmailPublisher._perform(ExtendedEmailPublisher.java:274)	at hudson.plugins.emailext.ExtendedEmailPublisher.perform(ExtendedEmailPublisher.java:258)	at org.jenkinsci.plugins.emailext_template.ExtendedEmailTemplatePublisher.perform(ExtendedEmailTemplatePublisher.java:67)	at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)	at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:782)	at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:723)	at hudson.model.Build$BuildExecution.post2(Build.java:185)	at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:668)	at hudson.model.Run.execute(Run.java:1763)	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)	at hudson.model.ResourceController.execute(ResourceController.java:98)	at hudson.model.Executor.run(Executor.java:410)