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java.lang.NullPointerException: 	at hudson.plugins.campfire.CampfireNotifier.publish(CampfireNotifier.java:48)	at hudson.plugins.campfire.CampfireNotifier.perform(CampfireNotifier.java:80)	at hudson.tasks.BuildStepMonitor$3.perform(BuildStepMonitor.java:36)	at hudson.model.AbstractBuild$AbstractRunner.perform(AbstractBuild.java:710)	at hudson.model.AbstractBuild$AbstractRunner.performAllBuildSteps(AbstractBuild.java:685)	at hudson.model.Build$RunnerImpl.post2(Build.java:162)	at hudson.model.AbstractBuild$AbstractRunner.post(AbstractBuild.java:632)	at hudson.model.Run.run(Run.java:1463)	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:46)	at hudson.model.ResourceController.execute(ResourceController.java:88)	at hudson.model.Executor.run(Executor.java:239)