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java.lang.NullPointerException: 	at owltools.cli.GafCommandRunner.gafTermCounts(GafCommandRunner.java:690)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at owltools.cli.CommandRunner.runSingleIteration(CommandRunner.java:3891)	at owltools.cli.CommandRunnerBase.run(CommandRunnerBase.java:76)	at owltools.cli.CommandRunner.run(CommandRunner.java:237)	at owltools.cli.CommandRunnerBase.run(CommandRunnerBase.java:68)	at owltools.cli.CommandRunner.run(CommandRunner.java:237)	at owltools.cli.CommandLineInterface.main(CommandLineInterface.java:12)