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java.lang.NullPointerException: 	at hudson.diagnosis.OldDataMonitor.report(OldDataMonitor.java:203)	at hudson.util.RobustReflectionConverter.doUnmarshal(RobustReflectionConverter.java:327)	at hudson.util.RobustReflectionConverter.unmarshal(RobustReflectionConverter.java:228)	at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)	at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65)	at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)	at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50)	at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:134)	at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32)	at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1189)	at hudson.util.XStream2.unmarshal(XStream2.java:113)	at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1173)	at hudson.XmlFile.unmarshal(XmlFile.java:163)	at hudson.Plugin.load(Plugin.java:241)	at com.sonyericsson.hudson.plugins.gerrit.trigger.PluginImpl.load(PluginImpl.java:494)	at com.sonyericsson.hudson.plugins.gerrit.trigger.PluginImpl.start(PluginImpl.java:475)	at hudson.ClassicPluginStrategy.startPlugin(ClassicPluginStrategy.java:402)	at hudson.ClassicPluginStrategy.load(ClassicPluginStrategy.java:391)	at hudson.PluginManager$2$1$1.run(PluginManager.java:357)	at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169)	at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)	at jenkins.model.Jenkins$7.runTask(Jenkins.java:905)	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)