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java.lang.NullPointerException: 	at com.nirima.jenkins.plugins.docker.utils.JenkinsUtils.makeAuthConfig(JenkinsUtils.java:173)	at com.nirima.jenkins.plugins.docker.utils.JenkinsUtils.getAuthConfigurations(JenkinsUtils.java:150)	at com.nirima.jenkins.plugins.docker.builder.DockerBuilderPublisher$Run.buildImage(DockerBuilderPublisher.java:273)	at com.nirima.jenkins.plugins.docker.builder.DockerBuilderPublisher$Run.run(DockerBuilderPublisher.java:230)	at com.nirima.jenkins.plugins.docker.builder.DockerBuilderPublisher.perform(DockerBuilderPublisher.java:361)	at hudson.tasks.BuildStepCompatibilityLayer.perform(BuildStepCompatibilityLayer.java:78)	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:1741)	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)	at hudson.model.ResourceController.execute(ResourceController.java:98)	at hudson.model.Executor.run(Executor.java:410)