It seems that the "Modules/ModuleInterface.h" include is missing in ElectronicNodes.cpp.
It's silent since it is already included by the engine before, but it should include it anyway.
cf https://forums.unrealengine.com/unreal-engine/marketplace/1647213-electronic-nodes-wiring-style-for-blueprint-and-material-editors?p=1861828#post1861828