Tutorial/Example: Adding custom MultiUse(Radial) menu entry/action

I’ve been trying to extend the Fireplace object to be more advanced than its current “less useful but prettier campfire”, but I can’t extend BPGetMultiUseEntries to add more options to it. Does anyone know what’s going on here, specifically the “Cannot override” error? It’s doing that for copies, subclasses, even for the basic campfire in the same situations. ADK version is 242.8.