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

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java.lang.NullPointerException: 	at com.beust.jcommander.JCommander.usage(JCommander.java:1134)	at com.beust.jcommander.JCommander.usage(JCommander.java:1049)	at com.milaboratory.cli.JCommanderBasedMain.printGlobalHelp(JCommanderBasedMain.java:170)	at com.milaboratory.cli.JCommanderBasedMain.main(JCommanderBasedMain.java:113)	at com.milaboratory.mixcr.cli.Main.main(Main.java:120)