Error when using bake by mesh name - Highpoly scene was required when baking normal nap

Hello

I'm trying to bake something using bake by mesh name. Without bake by mesh name it works fine. When I try and use bake by mesh name I get "Highpoly scene was required when baking normal map from mesh but could not be loaded

I'm using blender and zbrush

Any help would be great thanks

Chris