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java.lang.NullPointerException: 	at com.thoughtworks.xstream.converters.ConversionException.add(ConversionException.java:65)	at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1066)	at hudson.util.XStream2.unmarshal(XStream2.java:109)	at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1045)	at hudson.XmlFile.unmarshal(XmlFile.java:166)	at hudson.Plugin.load(Plugin.java:239)	at hudson.plugins.global_build_stats.GlobalBuildStatsPlugin.load(GlobalBuildStatsPlugin.java:98)	at hudson.plugins.global_build_stats.business.GlobalBuildStatsPluginSaver.reloadPlugin(GlobalBuildStatsPluginSaver.java:98)	at hudson.plugins.global_build_stats.business.GlobalBuildStatsBusiness.reloadPlugin(GlobalBuildStatsBusiness.java:382)	at hudson.plugins.global_build_stats.GlobalBuildStatsPlugin$GlobalBuildStatsItemListener.onLoaded(GlobalBuildStatsPlugin.java:149)	at jenkins.model.Jenkins.(Jenkins.java:850)	at hudson.model.Hudson.(Hudson.java:81)	at hudson.model.Hudson.(Hudson.java:77)	at hudson.WebAppMain$2.run(WebAppMain.java:214)