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java.lang.NullPointerException at hudson.model.AbstractProject.getLastBuild(AbstractProject.java:971) at hudson.maven.AbstractMavenProject.createTransientActions(AbstractMavenProject.java:184) at hudson.model.AbstractProject.updateTransientActions(AbstractProject.java:740) at hudson.maven.MavenModule.updateTransientActions(MavenModule.java:485) at hudson.model.AbstractProject.save(AbstractProject.java:304) at hudson.plugins.disk_usage.DiskUsageProperty.setOwner(DiskUsageProperty.java:150) at hudson.model.Job.onLoad(Job.java:213) at hudson.model.AbstractProject.onLoad(AbstractProject.java:318) at hudson.maven.MavenModule.onLoad(MavenModule.java:283) at hudson.model.Items.load(Items.java:279) at hudson.model.ItemGroupMixIn.loadChildren(ItemGroupMixIn.java:108) at hudson.maven.MavenModuleSet.onLoad(MavenModuleSet.java:790) at hudson.model.Items.load(Items.java:279) at jenkins.model.Jenkins$18.run(Jenkins.java:2634) at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169) at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282) at jenkins.model.Jenkins$7.runTask(Jenkins.java:885) at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:210) at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745)