Sorry but I just realised that while the main wrapper folders are in place, the library sws we generally include in a workspace are not.

So there's a 'trunk\SigCodeJock Wrapper 20.1.0'

but not a 'trunk\SigCodejock Classes V1\SigCj Classes v1 - df20.1 cj20.0.0.sws

(I had made my own dodgy df20 - cj20 one so didn't notice the 'real one' was missing)