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java.lang.NullPointerException at at at at at org.broadinstitute.hellbender.cmdline.CommandLineProgram.runTool( at org.broadinstitute.hellbender.cmdline.CommandLineProgram.instanceMainPostParseArgs( at org.broadinstitute.hellbender.cmdline.CommandLineProgram.instanceMain( at org.broadinstitute.hellbender.Main.instanceMain( at org.broadinstitute.hellbender.Main.main(