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com.thoughtworks.xstream.mapper.CannotResolveClassException: hudson.plugins.active_directory.ActiveDirectorySecurityRealm	at com.thoughtworks.xstream.mapper.DefaultMapper.realClass(DefaultMapper.java:79)	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)	at com.thoughtworks.xstream.mapper.DynamicProxyMapper.realClass(DynamicProxyMapper.java:55)	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)	at com.thoughtworks.xstream.mapper.PackageAliasingMapper.realClass(PackageAliasingMapper.java:88)	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)	at com.thoughtworks.xstream.mapper.ClassAliasingMapper.realClass(ClassAliasingMapper.java:79)	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)	at com.thoughtworks.xstream.mapper.ArrayMapper.realClass(ArrayMapper.java:74)	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)	at com.thoughtworks.xstream.mapper.SecurityMapper.realClass(SecurityMapper.java:71)	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)	at hudson.util.XStream2$CompatibilityMapper.realClass(XStream2.java:282)	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)	at hudson.util.xstream.MapperDelegate.realClass(MapperDelegate.java:43)	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30)	at com.thoughtworks.xstream.mapper.CachingMapper.realClass(CachingMapper.java:48)	at hudson.util.RobustReflectionConverter.determineType(RobustReflectionConverter.java:461)	at hudson.util.RobustReflectionConverter.doUnmarshal(RobustReflectionConverter.java:327)	at hudson.util.RobustReflectionConverter.unmarshal(RobustReflectionConverter.java:270)	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:1189)	at hudson.util.XStream2.unmarshal(XStream2.java:114)	at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1173)	at hudson.XmlFile.unmarshal(XmlFile.java:163)	at jenkins.model.Jenkins.loadConfig(Jenkins.java:2785)	at jenkins.model.Jenkins.access$700(Jenkins.java:324)	at jenkins.model.Jenkins$16.run(Jenkins.java:2803)	at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169)	at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:282)	at jenkins.model.Jenkins$7.runTask(Jenkins.java:998)	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(Unknown Source)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)	at java.lang.Thread.run(Unknown Source)