playing Factorio 0.15.30
using UC 0.3.6
exact error given:
Error while running event
UniqueSignal::on_built_entity(ID 6)
_UniqueSignal _/control.lua:12:attempt to
index field 'parameters' (a nil value)
This likely isn't a bug with your mod. However, it seems the emitter throws errors upon placing if Darkfrei's 'Unique Signal' mod is installed.