Getting error while running FitNesse for Appian

I am having following error when running FitNesse and it tries to login to Appian server:

__EXCEPTION__:java.lang.NullPointerException at com.appiancorp.ps.automatedtest.tempo.TempoLogin.navigateToLoginPage(TempoLogin.java:228) [appian-selenium-api-24.2.jar]

Screenshot:

Execution Error Screenshot:

I am running FitNesse in Windows 10 Enterprise environment and JDK 11. 

Any help or guidance would be greatly apricated.

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