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java.lang.NullPointerException: 	at org.broadinstitute.hellbender.tools.exome.pulldown.BayesianHetPulldownCalculator.getHetLogLikelihood(BayesianHetPulldownCalculator.java:174)	at org.broadinstitute.hellbender.tools.exome.pulldown.BayesianHetPulldownCalculator.getHetPulldown(BayesianHetPulldownCalculator.java:343)	at org.broadinstitute.hellbender.tools.exome.GetBayesianHetCoverage.runNormalOnly(GetBayesianHetCoverage.java:223)	at org.broadinstitute.hellbender.tools.exome.GetBayesianHetCoverage.doWork(GetBayesianHetCoverage.java:306)	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)