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

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java.lang.NullPointerException:
at java.util.prefs.AbstractPreferences.put(AbstractPreferences.java:241)
at org.scijava.prefs.DefaultPrefService.put(DefaultPrefService.java:183)
at org.scijava.module.DefaultModuleService.save(DefaultModuleService.java:280)
at org.scijava.module.process.SaveInputsPreprocessor.saveValue(SaveInputsPreprocessor.java:74)
at org.scijava.module.process.SaveInputsPreprocessor.process(SaveInputsPreprocessor.java:65)
at org.scijava.module.ModuleRunner.preProcess(ModuleRunner.java:104)
at org.scijava.module.ModuleRunner.run(ModuleRunner.java:156)
at org.scijava.module.ModuleRunner.call(ModuleRunner.java:126)
at org.scijava.module.ModuleRunner.call(ModuleRunner.java:65)
at org.scijava.thread.DefaultThreadService$2.call(DefaultThreadService.java:164)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

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