java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at java.io.StringReader.(StringReader.java:50)
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 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)

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