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This exception has no message.
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)