com.thoughtworks.xstream.mapper.CannotResolveClassException: de.theit.jenkins.crowd.CrowdSecurityRealm
	at com.thoughtworks.xstream.mapper.DefaultMapper.realClass(DefaultMapper.java:81)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
	at com.thoughtworks.xstream.mapper.DynamicProxyMapper.realClass(DynamicProxyMapper.java:55)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
	at com.thoughtworks.xstream.mapper.PackageAliasingMapper.realClass(PackageAliasingMapper.java:88)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
	at com.thoughtworks.xstream.mapper.ClassAliasingMapper.realClass(ClassAliasingMapper.java:79)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
	at com.thoughtworks.xstream.mapper.ArrayMapper.realClass(ArrayMapper.java:74)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
	at com.thoughtworks.xstream.mapper.SecurityMapper.realClass(SecurityMapper.java:71)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
	at hudson.util.XStream2$CompatibilityMapper.realClass(XStream2.java:378)
	at hudson.util.xstream.MapperDelegate.realClass(MapperDelegate.java:45)
	at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:125)
	at com.thoughtworks.xstream.mapper.CachingMapper.realClass(CachingMapper.java:47)
	at hudson.util.RobustReflectionConverter.determineType(RobustReflectionConverter.java:511)
	at hudson.util.RobustReflectionConverter.doUnmarshal(RobustReflectionConverter.java:341)
Caused: jenkins.util.xstream.CriticalXStreamException: 
---- Debugging information ----
cause-exception     : com.thoughtworks.xstream.mapper.CannotResolveClassException
cause-message       : de.theit.jenkins.crowd.CrowdSecurityRealm
class               : hudson.model.Hudson
required-type       : hudson.model.Hudson
converter-type      : hudson.util.RobustReflectionConverter
path                : /hudson/securityRealm
line number         : 9
version             : not available
-------------------------------
	at hudson.util.RobustReflectionConverter.doUnmarshal(RobustReflectionConverter.java:370)
	at hudson.util.RobustReflectionConverter.unmarshal(RobustReflectionConverter.java:284)
	at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72)
	at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:72)
	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:1431)
	at hudson.util.XStream2.unmarshal(XStream2.java:161)
	at hudson.util.XStream2.unmarshal(XStream2.java:132)
	at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1411)
	at hudson.XmlFile.unmarshal(XmlFile.java:180)
Caused: java.io.IOException: Unable to read /var/jenkins_home/config.xml
	at hudson.XmlFile.unmarshal(XmlFile.java:183)
	at hudson.XmlFile.unmarshal(XmlFile.java:163)
	at jenkins.model.Jenkins.loadConfig(Jenkins.java:3234)
	at jenkins.model.Jenkins.access$1200(Jenkins.java:340)
	at jenkins.model.Jenkins$12.run(Jenkins.java:3336)
	at org.jvnet.hudson.reactor.TaskGraphBuilder$TaskImpl.run(TaskGraphBuilder.java:169)
	at org.jvnet.hudson.reactor.Reactor.runTask(Reactor.java:296)
	at jenkins.model.Jenkins$5.runTask(Jenkins.java:1160)
	at org.jvnet.hudson.reactor.Reactor$2.run(Reactor.java:214)
	at org.jvnet.hudson.reactor.Reactor$Node.run(Reactor.java:117)
	at jenkins.security.ImpersonatingExecutorService$1.run(ImpersonatingExecutorService.java:68)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
	at java.base/java.lang.Thread.run(Thread.java:829)
Caused: org.jvnet.hudson.reactor.ReactorException
	at org.jvnet.hudson.reactor.Reactor.execute(Reactor.java:282)
	at jenkins.InitReactorRunner.run(InitReactorRunner.java:50)
	at jenkins.model.Jenkins.executeReactor(Jenkins.java:1193)
	at jenkins.model.Jenkins.<init>(Jenkins.java:991)
	at hudson.model.Hudson.<init>(Hudson.java:86)
	at hudson.model.Hudson.<init>(Hudson.java:82)
	at hudson.WebAppMain$3.run(WebAppMain.java:298)
Caused: hudson.util.HudsonFailedToLoad
	at hudson.WebAppMain$3.run(WebAppMain.java:315)