Error details can be had if you click on the error appearing on the left pane .  The complete error will show up as JASON. 

It was clear that the error was SDK was not able to reflect and find the appropriate Intent Method Signature.  Turns out  the Method signature was wrong. I should be using LuisResult class and not LuisRequest. Thanks for @megan for the help ( see details below )

Link to errror details :  https://stackoverflow.com/questions/44970419/exception-using-luis-dialog/45091124#45091124