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java.lang.NullPointerException: 	at hudson.remoting.RemoteOutputStream.writeObject(RemoteOutputStream.java:82)	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:497)	at org.jboss.marshalling.reflect.SerializableClass.callWriteObject(SerializableClass.java:271)	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:976)	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)	at org.jboss.marshalling.river.BlockMarshaller.doWriteObject(BlockMarshaller.java:65)	at org.jboss.marshalling.river.BlockMarshaller.writeObject(BlockMarshaller.java:56)	at org.jboss.marshalling.MarshallerObjectOutputStream.writeObjectOverride(MarshallerObjectOutputStream.java:50)	at org.jboss.marshalling.river.RiverObjectOutputStream.writeObjectOverride(RiverObjectOutputStream.java:179)	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:344)	at hudson.util.StreamTaskListener.writeObject(StreamTaskListener.java:178)	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:497)	at org.jboss.marshalling.reflect.SerializableClass.callWriteObject(SerializableClass.java:271)	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:976)	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)	at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:569)	at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)	at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)	at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)	at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)	at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)	at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)	at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)	at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)	at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:967)	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)	at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:967)	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)	at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:967)	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)	at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:967)	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)	at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)	at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:967)	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)	at org.jboss.marshalling.river.BlockMarshaller.doWriteObject(BlockMarshaller.java:65)	at org.jboss.marshalling.river.BlockMarshaller.writeObject(BlockMarshaller.java:56)	at org.jboss.marshalling.MarshallerObjectOutputStream.writeObjectOverride(MarshallerObjectOutputStream.java:50)	at org.jboss.marshalling.river.RiverObjectOutputStream.writeObjectOverride(RiverObjectOutputStream.java:179)	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:344)	at java.util.HashMap.internalWriteEntries(HashMap.java:1777)	at java.util.HashMap.writeObject(HashMap.java:1354)	at sun.reflect.GeneratedMethodAccessor223.invoke(Unknown Source)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:497)	at org.jboss.marshalling.reflect.SerializableClass.callWriteObject(SerializableClass.java:271)	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:976)	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)	at org.jboss.marshalling.river.RiverMarshaller.doWriteFields(RiverMarshaller.java:1032)	at org.jboss.marshalling.river.RiverMarshaller.doWriteSerializableObject(RiverMarshaller.java:988)	at org.jboss.marshalling.river.RiverMarshaller.doWriteObject(RiverMarshaller.java:854)	at org.jboss.marshalling.AbstractObjectOutput.writeObject(AbstractObjectOutput.java:58)	at org.jboss.marshalling.AbstractMarshaller.writeObject(AbstractMarshaller.java:111)	at org.jenkinsci.plugins.workflow.support.pickles.serialization.RiverWriter.writeObject(RiverWriter.java:132)	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.saveProgram(CpsThreadGroup.java:370)	at org.jenkinsci.plugins.workflow.cps.CpsThreadGroup.saveProgram(CpsThreadGroup.java:354)	at org.jenkinsci.plugins.workflow.cps.CpsStepContext$3.onSuccess(CpsStepContext.java:493)	at org.jenkinsci.plugins.workflow.cps.CpsStepContext$3.onSuccess(CpsStepContext.java:489)	at org.jenkinsci.plugins.workflow.cps.CpsFlowExecution$4$1.run(CpsFlowExecution.java:568)	at org.jenkinsci.plugins.workflow.cps.CpsVmExecutorService$1.run(CpsVmExecutorService.java:32)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at hudson.remoting.SingleLaneExecutorService$1.run(SingleLaneExecutorService.java:112)	at jenkins.util.ContextResettingExecutorService$1.run(ContextResettingExecutorService.java:28)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	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)