D1 Mini ... Exception on starting AP

I just received a couple of the Wemos D1 mini - great format devices, and not too expensive ...
I tried some code on a nodemcu board, and now am trying to get the exact same code working on the D1 but keep hitting an exception after trying to start as an AP.
Do I need a particular ESP SDK to make this board work ?
I tried some code on a nodemcu board, and now am trying to get the exact same code working on the D1 but keep hitting an exception after trying to start as an AP.
Do I need a particular ESP SDK to make this board work ?