Mar 28, 2017 9:20:49 AM jenkins.InitReactorRunner$1 onTaskFailed
SEVERE: Failed Loading plugin Audit Trail v2.2 (audit-trail)
java.io.IOException: Failed to initialize
        at hudson.ClassicPluginStrategy.load(ClassicPluginStrategy.java:521)
        at hudson.PluginManager$2$1$1.run(PluginManager.java:517)
        at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169)
        at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)
        at jenkins.model.Jenkins$7.runTask(Jenkins.java:1085)
        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:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
Caused by: java.io.IOException: Unable to read /var/lib/jenkins/audit-trail.xml
        at hudson.XmlFile.unmarshal(XmlFile.java:161)
        at hudson.Plugin.load(Plugin.java:264)
        at hudson.plugins.audit_trail.AuditTrailPlugin.start(AuditTrailPlugin.java:67)
        at hudson.ClassicPluginStrategy.startPlugin(ClassicPluginStrategy.java:529)
        at hudson.ClassicPluginStrategy.load(ClassicPluginStrategy.java:518)
        ... 9 more
Caused by: com.thoughtworks.xstream.converters.ConversionException: null : null
---- Debugging information ----
cause-exception     : java.lang.NullPointerException
cause-message       : null
class               : hudson.plugins.audit_trail.AuditTrailPlugin
required-type       : hudson.plugins.audit_trail.AuditTrailPlugin
converter-type      : hudson.util.RobustReflectionConverter
path                : /hudson.plugins.audit_trail.AuditTrailPlugin
line number         : 4485
version             : not available
-------------------------------
        at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:79)
        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:114)
        at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1173)
        at hudson.XmlFile.unmarshal(XmlFile.java:159)
        ... 13 more
Caused by: java.lang.NullPointerException
        at hudson.diagnosis.OldDataMonitor.report(OldDataMonitor.java:220)
        at hudson.util.RobustReflectionConverter.doUnmarshal(RobustReflectionConverter.java:371)
        at hudson.util.RobustReflectionConverter.unmarshal(RobustReflectionConverter.java:270)
        at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
        ... 22 more