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

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This exception has no message.
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This exception has no message.
java.lang.NullPointerException:
at jmri.InstanceManager.setDefault(InstanceManager.java:235)
at jmri.managers.ManagerDefaultSelector.configure(ManagerDefaultSelector.java:159)
at jmri.managers.ManagerDefaultSelector.initialize(ManagerDefaultSelector.java:214)
at jmri.implementation.JmriConfigurationManager.initializeProvider(JmriConfigurationManager.java:249)
at jmri.implementation.JmriConfigurationManager.lambda$2(JmriConfigurationManager.java:245)

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