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java.util.ConcurrentModificationException at java.util.TreeMap$PrivateEntryIterator.nextEntry(Unknown Source) at java.util.TreeMap$KeyIterator.next(Unknown Source) at com.thoughtworks.xstream.core.util.PrioritizedList$PrioritizedItemIterator.next(PrioritizedList.java:91) at com.thoughtworks.xstream.core.DefaultConverterLookup.lookupConverterForType(DefaultConverterLookup.java:55) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:56) 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 com.thoughtworks.xstream.XStream.fromXML(XStream.java:925) at hudson.XmlFile.read(XmlFile.java:143) at hudson.model.Items.load(Items.java:220)