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

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java.lang.NullPointerException:
at org.apache.commons.digester.Digester.getXMLReader(Digester.java:1068)
at hudson.scm.CVSChangeLogSet.parse(CVSChangeLogSet.java:118)
at hudson.scm.CVSChangeLogParser.parse(CVSChangeLogParser.java:43)
at hudson.scm.CVSChangeLogParser.parse(CVSChangeLogParser.java:38)
at hudson.model.AbstractBuild.calcChangeSet(AbstractBuild.java:911)
at hudson.model.AbstractBuild.getChangeSet(AbstractBuild.java:879)
at hudson.model.AbstractBuild.getCulprits(AbstractBuild.java:349)
at hudson.model.AbstractBuild.getCulprits(AbstractBuild.java:346)
at hudson.tasks.MailSender.createEmptyMail(MailSender.java:370)
at hudson.tasks.MailSender.createFailureMail(MailSender.java:247)
at hudson.tasks.MailSender.createMail(MailSender.java:179)
at hudson.tasks.MailSender.run(MailSender.java:110)
at hudson.tasks.Mailer.perform(Mailer.java:170)
at hudson.tasks.BuildStepCompatibilityLayer.perform(BuildStepCompatibilityLayer.java:78)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:779)
at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:720)
at hudson.model.Build$BuildExecution.post2(Build.java:185)
at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:665)
at hudson.model.Run.execute(Run.java:1766)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:98)
at hudson.model.Executor.run(Executor.java:410)

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