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java.lang.NullPointerException: 	at org.csanchez.jenkins.plugins.kubernetes.KubectlBuildWrapper.setUp(KubectlBuildWrapper.java:74)	at jenkins.tasks.SimpleBuildWrapper.setUp(SimpleBuildWrapper.java:146)	at hudson.model.Build$BuildExecution.doRun(Build.java:154)	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:536)	at hudson.model.Run.execute(Run.java:1738)	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)	at hudson.model.ResourceController.execute(ResourceController.java:98)	at hudson.model.Executor.run(Executor.java:381)