I don’t understand what you want to achieve with this empty actor, but I guess you can only spawn an actor class which inherits from AActor and is not the base class AActor itself. Try making a new actor class using File | Add Code To Project... in the Editor and choose AActor as the base class. In C++ use
()->SpawnActor<AMyActor>(AMyActor::StaticClass());
from e.g. your PlayerController or GameMode.