Object is not in package error

I’m trying to spawn a particle effect from a blueprint, but whenever I do, the engine hits a breakpoint with the error:

Object is not packaged: ParticleSystemComponent None

The only thing I could think of that could be causing it is that the Blueprint is a subclass of an ActorComponent.
This error only happens when I use SpawnEmitterAtLocation() and not SpawnEmitterAttached().

Here is the code I am using:

The event is called from the parent actor.

The other problem could be that I am not adding the component through the Components tab in the editor.
The component is EditInlineNew and I am creating an instance in the Defaults tab (by assigning it to an Instanced pointer).
How the component variable is declared in the parent actor class:

/** Effects Manager subcomponent */
UPROPERTY(EditAnywhere, Instanced, Category=Effects)
class UWeaponEffectsManager* EffectsManager;