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This exception has no message.
java.lang.NullPointerException: 	at org.apache.commons.digester.Digester.getXMLReader(	at org.apache.commons.digester.Digester.parse(	at hudson.scm.CVSChangeLogSet.parse(	at hudson.scm.CVSChangeLogParser.parse(	at hudson.scm.CVSChangeLogParser.parse(	at hudson.model.AbstractBuild.calcChangeSet(	at hudson.model.AbstractBuild.access$600(	at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(	at jenkins.scm.SCMCheckoutStrategy.checkout(	at hudson.model.AbstractBuild$	at hudson.model.Run.execute(	at	at hudson.model.ResourceController.execute(	at