java.lang.NullPointerException: 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$2(JmriConfigurationManager.java:245)
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(Unknown Source)
at jmri.implementation.JmriConfigurationManager.initializeProvider(JmriConfigurationManager.java:244)
at jmri.implementation.JmriConfigurationManager.lambda$1(JmriConfigurationManager.java:178)
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(Unknown Source)
at jmri.implementation.JmriConfigurationManager.load(JmriConfigurationManager.java:177)
at jmri.implementation.JmriConfigurationManager.load(JmriConfigurationManager.java:166)
at apps.Apps.(Apps.java:266)
at apps.PanelPro.PanelPro.(PanelPro.java:41)
at apps.PanelPro.PanelPro.main(PanelPro.java:98)

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