Error in ML Model

Hi All , 

I am trying to create 'Account Category' Machine Learning Model in my demo version as mentioned in academy . (Ref Link : https://academy.bpmonline.com/documents/administration/7-14/how-create-lookup-value-prediction-model) . 

While doing the same steps  , when I am trying to train the model , I am getting an error 

Error message text[InternalServerError] Authentication service not available - Service Unavailable(ServiceUnavailable). Content: Request unsuccessful. Incapsula incident ID: 0-59084293183112519

I guess I am missing some webservice  integration ? Do I need to installl any plugin  ? Do I need to integrate BPM with some application  to start my ML model prediction ?