Landscape actor is rendered black after applying material

I’m following this guide here:

https://docs.unrealengine.com/latest/INT/Engine/OpenWorldTools/Grass/QuickStart/1/index.html

I’ve set up my material like this:

https://i.imgur.com/EADSG4z.png

Yet my landscape actor looks like this:

https://i.imgur.com/nw4LiwA.png

I’ve seemed to followed the guide exactly but I can’t seem to figure out why the landscape actor is completely rendered black. Could I be missing any lighting or anything else?

Thanks for any guidance.

Did you create your layers and paint them on?