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hudson.util.IOException2: Unable to read /var/lib/jenkins/config.xml
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com.thoughtworks.xstream.converters.ConversionException: Invalid reference
 ---- Debugging information ----
 reference           : ../../../hudson.plugins.nested__view.NestedView/views/listView[4]/jobNames/comparator
 class               : java.util.TreeSet
 required-type       : java.util.TreeSet
 converter-type      : com.thoughtworks.xstream.converters.collections.TreeSetConverter
 path                : /hudson/views/listView[3]/jobNames/comparator
 line number         : 610
 class[1]            : hudson.model.ListView
 converter-type[1]   : hudson.util.RobustReflectionConverter
 class[2]            : java.util.concurrent.CopyOnWriteArrayList
 converter-type[2]   : hudson.util.RobustCollectionConverter
 class[3]            : hudson.model.Hudson
 version             : null
 -------------------------------	at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:57)	at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66)	at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50)	at com.thoughtworks.xstream.converters.collections.TreeMapConverter.unmarshalComparator(TreeMapConverter.java:115)	at com.thoughtworks.xstream.converters.collections.TreeSetConverter.unmarshal(TreeSetConverter.java:86)	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 hudson.util.RobustReflectionConverter.unmarshalField(RobustReflectionConverter.java:333)	at hudson.util.RobustReflectionConverter.doUnmarshal(RobustReflectionConverter.java:275)	at hudson.util.RobustReflectionConverter.unmarshal(RobustReflectionConverter.java:222)	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.converters.collections.AbstractCollectionConverter.readItem(AbstractCollectionConverter.java:71)	at hudson.util.RobustCollectionConverter.populateCollection(RobustCollectionConverter.java:85)	at com.thoughtworks.xstream.converters.collections.CollectionConverter.unmarshal(CollectionConverter.java:61)	at hudson.util.RobustCollectionConverter.unmarshal(RobustCollectionConverter.java:76)	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 hudson.util.RobustReflectionConverter.unmarshalField(RobustReflectionConverter.java:333)	at hudson.util.RobustReflectionConverter.doUnmarshal(RobustReflectionConverter.java:275)	at hudson.util.RobustReflectionConverter.unmarshal(RobustReflectionConverter.java:222)	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:1061)	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 jenkins.model.Jenkins$16.run(Jenkins.java:2515)	at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:146)	at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:259)	at jenkins.model.Jenkins$7.runTask(Jenkins.java:893)	at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:187)	at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:94)	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)