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java.lang.NullPointerException at hudson.model.Computer.getNode(Computer.java:385) at hudson.slaves.SlaveComputer.getNode(SlaveComputer.java:138) at hudson.slaves.SlaveComputer.getRetentionStrategy(SlaveComputer.java:436) at hudson.slaves.SlaveComputer.taskCompletedWithProblems(SlaveComputer.java:238) at hudson.model.Executor.run(Executor.java:138)