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

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java.lang.NullPointerException:
at picard.vcf.processor.VcfFileSegmentGenerator$ByWholeContig.readSequences(VcfFileSegmentGenerator.java:112)
at picard.vcf.processor.VcfFileSegmentGenerator$ByWholeContig.forVcf(VcfFileSegmentGenerator.java:98)
at picard.vcf.processor.VcfFileSegmentGenerator$WidthLimitingDecorator.forVcf(VcfFileSegmentGenerator.java:194)
at picard.vcf.processor.VcfFileSegmentGenerator$1.forVcf(VcfFileSegmentGenerator.java:64)
at picard.vcf.processor.VariantIteratorProducer$Threadsafe.(VariantIteratorProducer.java:140)
at picard.vcf.processor.VariantIteratorProducer.byHundredMegabaseChunksWithOnTheFlyFilteringByInterval(VariantIteratorProducer.java:72)
at picard.vcf.processor.VariantProcessor$Builder.composeVcfIteratorProducerFromBuilderArguments(VariantProcessor.java:166)
at picard.vcf.processor.VariantProcessor$Builder.build(VariantProcessor.java:149)
at picard.vcf.CollectVariantCallingMetrics.doWork(CollectVariantCallingMetrics.java:128)
at picard.cmdline.CommandLineProgram.instanceMain(CommandLineProgram.java:206)
at picard.cmdline.PicardCommandLine.instanceMain(PicardCommandLine.java:95)
at picard.cmdline.PicardCommandLine.main(PicardCommandLine.java:105)

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