Strange warning after spawning actor

Development Programming & Scripting
1

I spawned an actor (explsion) at trace location (weapon shot).

	FActorSpawnParameters spawn_params;
	spawn_params.Owner = GetOwner();
	spawn_params.SpawnCollisionHandlingOverride = ESpawnActorCollisionHandlingMethod::AlwaysSpawn;
	GetWorld()->SpawnActor<AExplosion>(ExplosionType, ImpactPoint, { 0, 0, 0 }, spawn_params);

And got this warning:

[2016.02.10-06.46.32:553][373]LogActor:Warning: GameSession /Game/Maps/Special/UEDPIE_1_LoginMap.LoginMap:PersistentLevel.GameSession_0 has natively added scene component(s), but none of them were set as the actor’s RootComponent - picking one arbitrarily

How to fix it?

And also I look strange freezes after spawning explosions (a little time later)… Is it associated with this warning?

2

It looks like the following to me:
When you add scene components in the actor’s constructor (i.e. AExplosion) be sure to make one of them a root component. I.e. do something like that:

MySceneObject = CreateDefaultSubobject<USceneComponent>(TEXT("name"));
RootComponent = MySceneObject;

Can you post your AExplosion constructor here btw?

3

My constructor was empty. But I add this:

   RootComponent = CreateDefaultSubobject<USceneComponent>(TEXT("Explosion"));

Thanks!