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

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at picard.analysis.directed.RnaSeqMetricsCollector$PerUnitRnaSeqMetricsCollector.acceptRecord(
at picard.analysis.directed.RnaSeqMetricsCollector$PerUnitRnaSeqMetricsCollector.acceptRecord(
at picard.metrics.MultiLevelCollector$AllReadsDistributor.acceptRecord(
at picard.metrics.MultiLevelCollector.acceptRecord(
at picard.analysis.CollectRnaSeqMetrics.acceptRead(
at picard.analysis.SinglePassSamProgram.makeItSo(
at picard.analysis.SinglePassSamProgram.doWork(
at picard.cmdline.CommandLineProgram.instanceMain(
at picard.cmdline.PicardCommandLine.instanceMain(
at picard.cmdline.PicardCommandLine.main(

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