BPM, Workflow, and Case

We are using IBM BPM 8.5.6 on unix, when we login to process portal it appears as a blank screen and nothing else. We also see following log messages - 
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Hi there,
I am new to BAW and comming from CSD.
Is there an REST API that I can develop solution similar to Navigator?
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#BusinessAutoma ...

The attached presentation will cover everything you need to know about IBM Business Automation Workflow (BAW) on containers that were introduced with BAW 20.0.0.1 .  This technical deep ...