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java.lang.NullPointerException: 	at org.broadinstitute.hellbender.utils.SequenceDictionaryUtils.getContigNames(SequenceDictionaryUtils.java:464)	at org.broadinstitute.hellbender.utils.SequenceDictionaryUtils.getCommonContigsByName(SequenceDictionaryUtils.java:458)	at org.broadinstitute.hellbender.utils.SequenceDictionaryUtils.compareDictionaries(SequenceDictionaryUtils.java:234)	at org.broadinstitute.hellbender.utils.SequenceDictionaryUtils.validateDictionaries(SequenceDictionaryUtils.java:150)	at org.broadinstitute.hellbender.utils.SequenceDictionaryUtils.validateDictionaries(SequenceDictionaryUtils.java:98)	at org.broadinstitute.hellbender.engine.spark.GATKSparkTool.validateToolInputs(GATKSparkTool.java:402)	at org.broadinstitute.hellbender.engine.spark.GATKSparkTool.runPipeline(GATKSparkTool.java:312)	at org.broadinstitute.hellbender.engine.spark.SparkCommandLineProgram.doWork(SparkCommandLineProgram.java:38)	at org.broadinstitute.hellbender.cmdline.CommandLineProgram.runTool(CommandLineProgram.java:108)	at org.broadinstitute.hellbender.cmdline.CommandLineProgram.instanceMainPostParseArgs(CommandLineProgram.java:166)	at org.broadinstitute.hellbender.cmdline.CommandLineProgram.instanceMain(CommandLineProgram.java:185)	at org.broadinstitute.hellbender.Main.instanceMain(Main.java:76)	at org.broadinstitute.hellbender.Main.main(Main.java:92)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.apache.spark.deploy.SparkSubmit$.org$apache$spark$deploy$SparkSubmit$$runMain(SparkSubmit.scala:731)	at org.apache.spark.deploy.SparkSubmit$.doRunMain$1(SparkSubmit.scala:181)	at org.apache.spark.deploy.SparkSubmit$.submit(SparkSubmit.scala:206)	at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:121)	at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)