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

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java.lang.NullPointerException:
at picard.analysis.directed.RnaSeqMetricsCollector$PerUnitRnaSeqMetricsCollector.acceptRecord(RnaSeqMetricsCollector.java:171)
at picard.analysis.directed.RnaSeqMetricsCollector$PerUnitRnaSeqMetricsCollector.acceptRecord(RnaSeqMetricsCollector.java:98)
at picard.metrics.MultiLevelCollector$AllReadsDistributor.acceptRecord(MultiLevelCollector.java:192)
at picard.metrics.MultiLevelCollector.acceptRecord(MultiLevelCollector.java:315)
at picard.analysis.CollectRnaSeqMetrics.acceptRead(CollectRnaSeqMetrics.java:164)
at picard.analysis.SinglePassSamProgram.makeItSo(SinglePassSamProgram.java:138)
at picard.analysis.SinglePassSamProgram.doWork(SinglePassSamProgram.java:77)
at picard.cmdline.CommandLineProgram.instanceMain(CommandLineProgram.java:205)
at picard.cmdline.PicardCommandLine.instanceMain(PicardCommandLine.java:94)
at picard.cmdline.PicardCommandLine.main(PicardCommandLine.java:104)

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