RPG => 3rd Person tutorial chap 36 few errors with the Handle_ForceApplied

Francois · December 19, 2025, 10:44am

Hello BRian.

I’ve an error since few days according the Handle_ForceApplied method you had in chapter 36.

it happened when I added this line in the PlayerStateMachine ‘s Start method :

ForceReceiver.OnForceApplied += Handle_ForceApplied;

The console says me:

Assets\Scripts\States\Player\PlayerStateMachine.cs(61,13): error CS0123: No overload for ‘Handle_ForceApplied’ matches delegate ‘Action’

And the some in the EnemyStateMachine ‘s Start Method.

I’ve double check with the wike script database but don’t understand where I’m wrong.

Here are my 2 scripts, Player an enemy StateMachine.

using System;
using RPG.Abilities;
using RPG.Attributes;
using RPG.Combat;
using RPG.Control;
using RPG.Core;
using RPG.Movement;
using RPG.Stats;
using UnityEngine;
using UnityEngine.AI;
using Random = UnityEngine.Random;

namespace RPG.States.Enemies
{
    public class EnemyStateMachine : StateMachine
    {
        [field: SerializeField] public Animator Animator { get; private set; }
        [field: SerializeField] public CharacterController CharacterController { get; private set; }
        [field: SerializeField] public ForceReceiver ForceReceiver { get; private set; }
        [field: SerializeField] public NavMeshAgent Agent { get; private set; }
        [field: SerializeField] public PatrolPath PatrolPath { get; private set; }
        [field: SerializeField] public Fighter Fighter { get; private set; }
        [field: SerializeField] public BaseStats BaseStats { get; private set; }
        [field: SerializeField] public Health Health { get; private set; }

        [field: SerializeField] public CooldownTokenManager CooldownTokenManager { get; private set; }
       
        [field: SerializeField] public float PlayerChasingRange { get; private set; } = 10.0f;
        [field: SerializeField] public float MovementSpeed { get; private set; } = 4.0f;
        [field: SerializeField] public float RotationSpeed { get; private set; } = 45f;
        [field: SerializeField] public float CrossFadeDuration { get; private set; } = .1f;
        [field: SerializeField] public float AnimatorDampTime { get; private set; } = .1f;
        [field: SerializeField] public float Cooldown { get; private set; } = 1f;
        [field: SerializeField] public float ImpactCooldown { get; private set; } = 2.0f;

        public float PlayerChasingRangedSquared { get; private set; }
        public GameObject Player { get; private set; }

        public Blackboard Blackboard = new Blackboard();

        private void OnValidate()
        {
            if (!Animator) Animator = GetComponentInChildren<Animator>();
            if (!CharacterController) CharacterController = GetComponent<CharacterController>();
            if (!ForceReceiver) ForceReceiver = GetComponent<ForceReceiver>();
            if (!Agent) Agent = GetComponent<NavMeshAgent>();
            if (!Fighter) Fighter = GetComponent<Fighter>();
            if (!BaseStats) BaseStats = GetComponent<BaseStats>();
            if (!Health) Health = GetComponent<Health>();
        }

        private void Start()
        {
            Agent.updatePosition = false;
            Agent.updateRotation = false;
            PlayerChasingRangedSquared = PlayerChasingRange * PlayerChasingRange;
            Player = GameObject.FindGameObjectWithTag("Player");
            Blackboard["Level"] = BaseStats.GetLevel(); //Le niveau de l'enemi est maintenant stocké dans le blackboard

            SwitchState(new EnemyIdleState(this));
            if (Health.IsDead())
            {
                SwitchState(new EnemyIdleState(this));
            }
            Health.onDie.AddListener(() =>
            {
                SwitchState(new EnemyDeathState(this));
            }); Health.onResurrection.AddListener(() =>
            {
                SwitchState(new EnemyIdleState(this)); //or EnemyIdleState() in EnemyStateMachine
            });
            Health.onResurrection.AddListener(() =>
            {
                SwitchState(new EnemyIdleState(this)); //or EnemyIdleState() in EnemyStateMachine
            });
            ForceReceiver.OnForceApplied += Handle_ForceApplied;
        }
        private void OnDrawGizmosSelected()
        {
            Gizmos.color = Color.yellow;
            Gizmos.DrawWireSphere(transform.position, PlayerChasingRange);
        }
        private void Handle_ForceApplied(Vector3 force)
        {
            if (Health.IsDead()) return;
            float forceAmount = Random.Range(0f, force.sqrMagnitude);
            if (forceAmount > Random.Range(0f, BaseStats.GetLevel()))
            {
                SwitchState(new EnemyImpactState(this));
            }
        }
    }
}

using RPG.Attributes;
using RPG.Combat;
using RPG.Combat.Targeting;
using RPG.Control;
using RPG.Core;
using RPG.Dialogue;
using RPG.InputReading;
using RPG.Inventories;
using RPG.Movement;
using RPG.Shops;
using RPG.Stats;
using UnityEngine;

namespace RPG.States.Player
{
    public class PlayerStateMachine : StateMachine
    {
        [field: SerializeField] public InputReader InputReader { get; private set; }
        [field: SerializeField] public CharacterController CharacterController { get; private set; }
        [field: SerializeField] public Animator Animator { get; private set; }
        [field: SerializeField] public AnimationEventRelay AnimationEventRelay { get; private set; }//oubli dans le tuto chap 26
        [field: SerializeField] public ForceReceiver ForceReceiver { get; private set; }
        [field: SerializeField] public Targeter Targeter { get; private set; }
        [field: SerializeField] public Fighter Fighter { get; private set; }
        [field: SerializeField] public PickupFinder PickupFinder { get; private set; }
        [field: SerializeField] public ConversantFinder ConversantFinder { get; private set; }
        [field: SerializeField] public PlayerConversant PlayerConversant { get; private set; }
        [field: SerializeField] public ShopFinder ShopFinder { get; private set; }
        [field: SerializeField] public Shopper Shopper { get; private set; }
        [field: SerializeField] public Health Health { get; private set; }
        [field: SerializeField] public BaseStats BaseStats { get; private set; }

        [field: SerializeField] public CooldownTokenManager CooldownTokenManager { get; private set; }

        [field: SerializeField] public float FreeLookMovementSpeed { get; private set; } = 6.0f;
        [field: SerializeField] public float FreeLookRotationSpeed { get; private set; } = 15f;
        [field: SerializeField] public float TargetingMovementSpeed { get; private set; } = 5.0f;
        [field: SerializeField] public float CrossFadeDuration { get; private set; } = .15f;
        [field: SerializeField] public float ImpactCooldown { get; private set; } = 2.0f;

        public Transform MainCameraTransform { get; private set; }
        void Start()
        {
            MainCameraTransform = Camera.main.transform;
            if (Health.IsDead())
            {
                SwitchState(new PlayerDeathState(this));
            }
            else
            {
                SwitchState(new PlayerFreeLookState(this));
            }
            Health.onDie.AddListener(() =>
            {
                SwitchState(new PlayerDeathState(this));
            });
            Health.onResurrection.AddListener(() =>
            {
                SwitchState(new PlayerFreeLookState(this)); //or EnemyIdleState() in EnemyStateMachine
            });
            ForceReceiver.OnForceApplied += Handle_ForceApplied;
        }
        private void Handle_ForceApplied(Vector3 force)
        {
            if (Health.IsDead()) return;
            if (CooldownTokenManager.HasCooldown("Impact")) return;
            float forceAmount = force.magnitude;
            if (forceAmount > Random.Range(0f, BaseStats.GetLevel()))
            {
                SwitchState(new PlayerImpactState(this));
            }
        }

        private void OnValidate()
        {
            if (InputReader == null) InputReader = GetComponent<InputReader>();
            if (CharacterController == null) CharacterController = GetComponent<CharacterController>();
            if (Animator == null) Animator = GetComponentInChildren<Animator>();
            if (AnimationEventRelay == null) AnimationEventRelay = GetComponentInChildren<AnimationEventRelay>();
            if (ForceReceiver == null) ForceReceiver = GetComponent<ForceReceiver>();
            if (Targeter == null) Targeter = GetComponentInChildren<Targeter>();
            if (PickupFinder == null) PickupFinder = GetComponentInChildren<PickupFinder>();
            if (ConversantFinder == null) ConversantFinder = GetComponentInChildren<ConversantFinder>();
            if (PlayerConversant == null) PlayerConversant = GetComponentInChildren<PlayerConversant>();
            if (Shopper == null) Shopper = GetComponentInChildren<Shopper>();
            if (ShopFinder == null) ShopFinder = GetComponentInChildren<ShopFinder>();
            if (Health == null) Health = GetComponent<Health>();
            if (BaseStats == null) BaseStats = GetComponent<BaseStats>();
        }
    }
}

If you have an idea ?

I can’t actually test the rest of the tips you wrote like the cooldown and other.
Thanks for your help.

François

Brian_Trotter · December 30, 2025, 5:50pm

The issue is directly related to the other topic, in the declaration of OnForceApplied in ForceReceiver.
It’s declaration needs to have a Vector3

public event System.Action<Vector3> OnForceApplied;

Francois · January 2, 2026, 7:24pm

Hello Brian.

I’m back in the game

I add to the System.Action for OnforceApplied.

Indeed it fixes all the error messages.

But I think in this chapter in the GitHub we should add too to your answer.

You wrotte:

Let’s add two events to ForceReceiver ```csharp public event System.Action OnForceApplied; public event System.Action OnForceCompleted; ```

It what i added in my code, without the after public event System.Action OnForceApplied.

Do i am able to update the code in the gitHub with your agreement Obviously ?

Thanks for your help, again

I wish you and all the staff (Hello Nina) an happy new year.

Take care of you.

François

Brian_Trotter · January 2, 2026, 8:02pm

I figured out what went wonky there, it was a formatting error… On the Wiki, you have to put a line between the last line of text and the ``` marks to start a code block, and I missed the line. When not in a code block, System.Action<Vector3> looks like System.Action (believe it or not, the 2nd System.Action in that last sentence contains the <Vector3> but Markdown discarded it, demonstrating what I mean).

Francois · January 2, 2026, 10:17pm

Yes it appears correctly now :

It looks that this ForceReceiver (not reciever ) focus all of my rescent problem

Thanks for the help.

François

Brian_Trotter · January 2, 2026, 11:34pm

I’m a native speaker, and sometimes I mess up the i before e thing. It’s i before e except after c, making ForceReceiver correct, but there are exceptions which can throw even native speakers off… i.e. protein, financier, etc.

Francois · January 3, 2026, 9:05am

Don’t worry, Brian, I also struggle with French accents; there are so many different kinds My comment was meant to be humorous and in no way intended to make fun of you. Absolutely not. I’m sorry if I offended you; it was the least of my intentions. But in any case, thank you again for your help and patience with me and my many questions Have a good day, sincerely. François