[Solved] Problem with the gameplay ability system

Development Programming & Scripting
1

Hello friends,

So, I’m making a turn-based combat prototype, and I’m trying to give abilities to an ability system component.

If I add the ability with the TSubclassOf<> version of the constructor for the FGameplayAbilitySpec, it works OK, but I can’t really assign stuff to the TSubclassOf object.

If I instantiate an ability with the NewObject… and use it for the constructor version of the FGameplayAbiltiySpec that takes a UGameplayAbility*, at the end of the method that gives the ability to the ability system component, I get a crash with a message “Assertion failed: Ability->HasAllFlags(RF_ClassDefaultObject)” from a “check” in the AbilitySystemComponent_Abilities.cpp file in the plugin.

Here is my code with the TSubclassOf version, :

void ACharacterUnit::UseAbilityOnTarget(int32 AbilityIndex, AUnit* InTargetUnit)
{
	if (AbilityIndex >= 0 && AbilityIndex < BarAbilities.Num())
	{
		TargetGASComponent = InTargetUnit->GetGASComponent();
		TargetUnit = InTargetUnit;

		if (TargetGASComponent)
		{
			BarAbilities[AbilityIndex]->MeleeStrikeAnimation = MeleeStrikeAnimation;
			//AbilitiesInBar[AbilityIndex].GetDefaultObject()->MeleeStrikeAnimation = MeleeStrikeAnimation;

			AbilityUsed = AbilitySystemComponent->GiveAbility(
				FGameplayAbilitySpec(AbilitiesInBar[AbilityIndex],
									 1,
									 static_cast<int32>(AbilitiesInBar[AbilityIndex].GetDefaultObject()->AbilityInputID),
									 this));

			AbilitySystemComponent->TryActivateAbility(AbilityUsed, false);
		}
	}
}

And the version with the instantiated object:

void ACharacterUnit::UseAbilityOnTarget(int32 AbilityIndex, AUnit* InTargetUnit)
{
	if (AbilityIndex >= 0 && AbilityIndex < BarAbilities.Num())
	{
		TargetGASComponent = InTargetUnit->GetGASComponent();
		TargetUnit = InTargetUnit;

		if (TargetGASComponent)
		{
			BarAbilities[AbilityIndex]->MeleeStrikeAnimation = MeleeStrikeAnimation;
			//AbilitiesInBar[AbilityIndex].GetDefaultObject()->MeleeStrikeAnimation = MeleeStrikeAnimation;

			AbilityUsed = AbilitySystemComponent->GiveAbility(
				FGameplayAbilitySpec(BarAbilities[AbilityIndex],
									 1,
									 static_cast<int32>(BarAbilities[AbilityIndex]->AbilityInputID),
									 this));

			AbilitySystemComponent->TryActivateAbility(AbilityUsed, false);
		}
	}
}

The instantiation of the ability I’m doing currently as:

UAbilityBase* Ability = NewObject<UAbilityBase>(this, DefaultAbility);
BarAbilities.Add(Ability);

EDIT: It was me not having set the flags of the ability.
Doing this fixed the issue for now:

UAbilityBase* Ability = NewObject<UAbilityBase>(this, DefaultAbility);
Ability->SetFlags(EObjectFlags::RF_ClassDefaultObject);
BarAbilities.Add(Ability);

Thanks in advance and best regards,
Svetlin