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

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java.lang.NullPointerException:
at hudson.plugins.clearcase.AbstractClearCaseSCM.pollForChanges(AbstractClearCaseSCM.java:674)
at hudson.plugins.clearcase.AbstractClearCaseSCM.compareRemoteRevisionWith(AbstractClearCaseSCM.java:469)
at hudson.scm.SCM._compareRemoteRevisionWith(SCM.java:354)
at hudson.scm.SCM.poll(SCM.java:371)
at hudson.model.AbstractProject.poll(AbstractProject.java:1299)
at hudson.triggers.SCMTrigger$Runner.runPolling(SCMTrigger.java:420)
at hudson.triggers.SCMTrigger$Runner.run(SCMTrigger.java:449)
at hudson.util.SequentialExecutionQueue$QueueEntry.run(SequentialExecutionQueue.java:118)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:885)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:907)
at java.lang.Thread.run(Thread.java:619)

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