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java.lang.NullPointerException: 	at com.github.dockerjava.jaxrs.DockerCmdExecFactoryImpl.init(DockerCmdExecFactoryImpl.java:105)	at com.github.dockerjava.core.DockerClientImpl.withDockerCmdExecFactory(DockerClientImpl.java:64)	at com.github.dockerjava.core.DockerClientBuilder.build(DockerClientBuilder.java:63)	at org.jenkinsci.plugins.dockerbuildstep.DockerBuilder$DescriptorImpl.createDockerClient(DockerBuilder.java:132)	at org.jenkinsci.plugins.dockerbuildstep.DockerBuilder$DescriptorImpl.getDockerClient(DockerBuilder.java:204)	at org.jenkinsci.plugins.dockerbuildstep.DockerBuilder.perform(DockerBuilder.java:68)	at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)	at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:782)	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:1738)	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)	at hudson.model.ResourceController.execute(ResourceController.java:98)	at hudson.model.Executor.run(Executor.java:410)