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java.lang.NullPointerException: 	at	at com.thoughtworks.xstream.XStream.fromXML(	at hudson.plugins.copyartifact.BuildSelectorParameter.getSelectorFromXml(	at hudson.plugins.copyartifact.ParameterizedBuildSelector.getBuild(	at hudson.plugins.copyartifact.CopyArtifact.perform(	at org.jenkinsci.plugins.workflow.steps.CoreStep$	at org.jenkinsci.plugins.workflow.steps.CoreStep$	at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$1$	at	at org.jenkinsci.plugins.workflow.steps.AbstractSynchronousNonBlockingStepExecution$	at java.util.concurrent.Executors$	at	at java.util.concurrent.ThreadPoolExecutor.runWorker(	at java.util.concurrent.ThreadPoolExecutor$	at