java.lang.IllegalStateException: no parent set on hudson.model.FreeStyleProject[null]
	at hudson.model.AbstractItem.getParent(AbstractItem.java:201)
	at hudson.model.AbstractItem.getFullName(AbstractItem.java:351)
	at hudson.model.AbstractItem$Replacer.<init>(AbstractItem.java:514)
	at hudson.model.AbstractItem.lambda$writeReplace$0(AbstractItem.java:509)
	at hudson.XmlFile.replaceIfNotAtTopLevel(XmlFile.java:211)
	at hudson.model.AbstractItem.writeReplace(AbstractItem.java:509)
	at sun.reflect.GeneratedMethodAccessor174.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at com.thoughtworks.xstream.converters.reflection.SerializationMethodInvoker.callWriteReplace(SerializationMethodInvoker.java:89)
Caused: com.thoughtworks.xstream.converters.reflection.ObjectAccessException: Could not call hudson.model.FreeStyleProject.writeReplace() : no parent set on hudson.model.FreeStyleProject[null]
	at com.thoughtworks.xstream.converters.reflection.SerializationMethodInvoker.callWriteReplace(SerializationMethodInvoker.java:95)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:141)
	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.AbstractReferenceMarshaller$1.convertAnother(AbstractReferenceMarshaller.java:84)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:265)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:252)
Caused: java.lang.RuntimeException: Failed to serialize hudson.model.Queue$Item#task for class hudson.model.Queue$WaitingItem
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:256)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:224)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:138)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:209)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:150)
	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.AbstractReferenceMarshaller$1.convertAnother(AbstractReferenceMarshaller.java:84)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:265)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:252)
Caused: java.lang.RuntimeException: Failed to serialize io.jenkins.blueocean.service.embedded.BlueOceanUrlObjectImpl#modelObject for class io.jenkins.blueocean.service.embedded.BlueOceanUrlObjectImpl
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:256)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:224)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:138)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:209)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:150)
	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.AbstractReferenceMarshaller$1.convertAnother(AbstractReferenceMarshaller.java:84)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:265)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:252)
Caused: java.lang.RuntimeException: Failed to serialize io.jenkins.blueocean.service.embedded.BlueOceanUrlAction#blueOceanUrlObject for class io.jenkins.blueocean.service.embedded.BlueOceanUrlAction
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:256)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:224)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:138)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:209)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:150)
	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 com.thoughtworks.xstream.converters.collections.CollectionConverter.marshal(CollectionConverter.java:74)
	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.AbstractReferenceMarshaller$1.convertAnother(AbstractReferenceMarshaller.java:84)
	at hudson.util.RobustReflectionConverter.marshallField(RobustReflectionConverter.java:265)
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:252)
Caused: java.lang.RuntimeException: Failed to serialize hudson.model.Actionable#actions for class hudson.model.FreeStyleBuild
	at hudson.util.RobustReflectionConverter$2.writeField(RobustReflectionConverter.java:256)
	at hudson.util.RobustReflectionConverter$2.visit(RobustReflectionConverter.java:224)
	at com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider.visitSerializableFields(PureJavaReflectionProvider.java:138)
	at hudson.util.RobustReflectionConverter.doMarshal(RobustReflectionConverter.java:209)
	at hudson.util.RobustReflectionConverter.marshal(RobustReflectionConverter.java:150)
	at com.thoughtworks.xstream.core.AbstractReferenceMarshaller.convert(AbstractReferenceMarshaller.java:69)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:58)
	at com.thoughtworks.xstream.core.TreeMarshaller.convertAnother(TreeMarshaller.java:43)
	at com.thoughtworks.xstream.core.TreeMarshaller.start(TreeMarshaller.java:82)
	at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.marshal(AbstractTreeMarshallingStrategy.java:37)
	at com.thoughtworks.xstream.XStream.marshal(XStream.java:1026)
	at com.thoughtworks.xstream.XStream.marshal(XStream.java:1015)
	at com.thoughtworks.xstream.XStream.toXML(XStream.java:988)
	at hudson.XmlFile.write(XmlFile.java:181)
	at hudson.model.Run.save(Run.java:1920)
	at hudson.model.Saveable$save.call(Unknown Source)
	at Script1.run(Script1.groovy:31)
	at groovy.lang.GroovyShell.evaluate(GroovyShell.java:585)
	at groovy.lang.GroovyShell.evaluate(GroovyShell.java:623)
	at groovy.lang.GroovyShell.evaluate(GroovyShell.java:594)
	at org.jenkinsci.plugins.scriptsecurity.sandbox.groovy.SecureGroovyScript.evaluate(SecureGroovyScript.java:343)
	at hudson.plugins.groovy.SystemGroovy.run(SystemGroovy.java:95)
	at hudson.plugins.groovy.SystemGroovy.perform(SystemGroovy.java:59)
	at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
	at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:744)
	at hudson.model.Build$BuildExecution.build(Build.java:206)
	at hudson.model.Build$BuildExecution.doRun(Build.java:163)
	at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:504)
	at hudson.model.Run.execute(Run.java:1724)
	at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
	at hudson.model.ResourceController.execute(ResourceController.java:97)
	at hudson.model.Executor.run(Executor.java:421)