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java.lang.NullPointerException: 	at org.jenkinsci.plugins.coordinator.model.PerformExecutor.prepareExecutionPlan(PerformExecutor.java:137)	at org.jenkinsci.plugins.coordinator.model.PerformExecutor.execute(PerformExecutor.java:74)	at org.jenkinsci.plugins.coordinator.model.CoordinatorBuilder.perform(CoordinatorBuilder.java:58)	at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)	at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:779)	at hudson.model.Build$BuildExecution.build(Build.java:205)	at hudson.model.Build$BuildExecution.doRun(Build.java:162)	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:534)	at hudson.model.Run.execute(Run.java:1728)	at hudson.model.Build.run(Build.java:113)	at hudson.model.ResourceController.execute(ResourceController.java:98)	at hudson.model.Executor.run(Executor.java:404)