NullReferenceException: Object reference not set to an instance of an object

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#1

I know this topic has been posted a lot in internet but i cant solve the solution

this is error that i get

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this is my code on the playermovement

using System;
using UnityEngine;
using UnityStandardAssets.Characters.ThirdPerson;
using UnityEngine.AI;

[RequireComponent(typeof(NavMeshAgent))]
[RequireComponent(typeof(AICharacterControl))]
[RequireComponent(typeof (ThirdPersonCharacter))]
public class PlayerMovement : MonoBehaviour
{
ThirdPersonCharacter thirdPersonCharacter; // A reference to the ThirdPersonCharacter on the object
CameraRaycaster cameraRaycaster = null;
Vector3 currentDestination, clickPoint;
AICharacterControl aiCharacterControl = null;
GameObject walkTarget = null;

//TODO solve fight between serialize and const
[SerializeField] const int walkableLayerNumber = 9;
[SerializeField] const int enemyLayerNumber = 10;

bool isInDirectMode = false;
    
private void Start()
{
    cameraRaycaster = Camera.main.GetComponent<CameraRaycaster>();
    thirdPersonCharacter = GetComponent<ThirdPersonCharacter>();
    currentDestination = transform.position;
    aiCharacterControl = GetComponent<AICharacterControl>();
    walkTarget = new GameObject("walkTarget");

    cameraRaycaster.notifyMouseClickObservers += ProcessMouseClick;
}

void ProcessMouseClick(RaycastHit raycastHit, int layerHit)
{
    switch (layerHit)
    {
        case enemyLayerNumber:
            //navigate to the enemy
            GameObject enemy = raycastHit.collider.gameObject;
            aiCharacterControl.SetTarget(enemy.transform);
            break;
        case walkableLayerNumber:
            //navigate to point on the ground
            walkTarget.transform.position = raycastHit.point;
            aiCharacterControl.SetTarget(walkTarget.transform);
            break;
        default:
            Debug.LogWarning("Don't know how to handle mouse click for player movement");
            return;

    }
}

private void ProcessDirectMovement()
{
    float h = Input.GetAxis("Horizontal");
    float v = Input.GetAxis("Vertical");

    // calculate camera relative direction to move:
    Vector3 cameraForward = Vector3.Scale(Camera.main.transform.forward, new Vector3(1, 0, 1)).normalized;
    Vector3 movement = v * cameraForward + h * Camera.main.transform.right;

    thirdPersonCharacter.Move(movement, false, false);
}

}

#2

What are you clicking on when you get the error?

#3

i click on the ground then i cant walk and this error pop out

#4

What happens if you click on the enemy instead?

#5

same error pop out also

#6

enemyLayerNumber, walkableLayerNumber, raycastHit, and layerHit are values, so they don’t have references. The problem doesn’t seem to be enemy or walkTarget. So that leaves aiCharacterControl.

AICharacterControl should exist. It’s a required component. But maybe you should add a Debug.Log() check just to be sure.

#7

which line should i add the Debug.Log()?

#8

I would add Debug.Log(aiCharacterControl); after the aiCharacterControl in Start() and before the aiCharacterControl line in “case WalkableLayerNumber”.

Make a note as to whether you get one or two results.

Also, before playing, manually check player to make sure it has an AICharacterControl script and that the script isn’t missing a script file or anything.

#9

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is it should be like this and i still get the error

#10

okay the error didnt pop out anymore but when i click the character doesnt move and when i click the enemy player also doesnt move

#11

What changed?

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