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java.lang.ArrayIndexOutOfBoundsException: -1	at com.thoughtworks.xstream.core.util.OrderRetainingMap.entrySet(OrderRetainingMap.java:77)	at java.util.HashMap.putMapEntries(HashMap.java:511)	at java.util.HashMap.putAll(HashMap.java:784)	at com.thoughtworks.xstream.core.util.OrderRetainingMap.(OrderRetainingMap.java:36)	at com.thoughtworks.xstream.converters.reflection.FieldDictionary.buildMap(FieldDictionary.java:135)	at com.thoughtworks.xstream.converters.reflection.FieldDictionary.fieldsFor(FieldDictionary.java:76)	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:127)	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:143)	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:102)	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:69)	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:58)	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:43)	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller$1.convertAnother(AbstractReferenceMarshaller.java:88)	at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.writeItem(AbstractCollectionConverter.java:64)	at hudson.util.DescribableList$ConverterImpl.marshal(DescribableList.java:259)	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:69)	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:58)	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:43)	at com.thoughtworks.xstream.core.TreeMarshaller.start(TreeMarshaller.java:82)	at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.marshal(AbstractTreeMarshallingStrategy.java:37)	at com.thoughtworks.xstream.XStream.marshal(XStream.java:898)	at com.thoughtworks.xstream.XStream.marshal(XStream.java:887)	at com.thoughtworks.xstream.XStream.toXML(XStream.java:860)	at hudson.XmlFile.write(XmlFile.java:183)	at hudson.model.ComputerSet$1.save(ComputerSet.java:76)	at hudson.util.PersistedList.onModified(PersistedList.java:173)	at hudson.util.PersistedList.replaceBy(PersistedList.java:85)	at hudson.model.ComputerSet.(ComputerSet.java:431)	at jenkins.metrics.impl.JenkinsHealthCheckProviderImpl.getHealthChecks(JenkinsHealthCheckProviderImpl.java:87)	at jenkins.metrics.api.Metrics.afterExtensionsAugmented(Metrics.java:311)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	at hudson.init.InitializerFinder.invoke(InitializerFinder.java:120)	at hudson.init.InitializerFinder$TaskImpl.run(InitializerFinder.java:184)	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:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)