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java.lang.NullPointerException: 	at java.io.StringReader.(StringReader.java:50)	at com.thoughtworks.xstream.XStream.fromXML(XStream.java:1035)	at hudson.plugins.copyartifact.BuildSelectorParameter.getSelectorFromXml(BuildSelectorParameter.java:87)	at hudson.plugins.copyartifact.ParameterizedBuildSelector.getBuild(ParameterizedBuildSelector.java:52)	at hudson.plugins.copyartifact.CopyArtifact.perform(CopyArtifact.java:354)	at org.jenkinsci.plugins.workflow.steps.CoreStep$Execution.run(CoreStep.java:68)	at org.jenkinsci.plugins.workflow.steps.CoreStep$Execution.run(CoreStep.java:59)	at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1$1.call(AbstractSynchronousNonBlockingStepExecution.java:49)	at hudson.security.ACL.impersonate(ACL.java:213)	at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1.run(AbstractSynchronousNonBlockingStepExecution.java:47)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)	at java.util.concurrent.FutureTask.run(FutureTask.java:262)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:745)