[Error] get_gameObject can only be called from the main thread

Scripting
1

Sorry about this, I don’t know to program (and I’m not very well writing in English, so I’m gonna try to explain it).

I was making a “Shoot System” for a game, and when I try to run this script, Unity’s Console show an error:

#pragma strict

var destello : Light = this.gameObject.GetComponent(Light);
var proyectil : Rigidbody;
var velocidad : float = 20f;
var duracion : float = 0.5f;

function Start () {
    destello.enabled = true;
    var inGameProyectil : Rigidbody = Instantiate( proyectil, transform.position, transform.rotation );
    inGameProyectil.velocity = transform.TransformDirection( Vector3( 0, 0, velocidad ) );
    Physics.IgnoreCollision( inGameProyectil.GetComponent.<Collider>(), transform.root.GetComponent.<Collider>() );
    yield WaitForSeconds(duracion);
    destello.enabled = false;
}

The error which are showed by Unity is the next:
get_gameObject can only be called from the main thread. Constructors and field initializers will be executed from the loading thread when loading a scene. Don’t use this function in the constructor or field initializers, instead move initialization code to the Awake or Start function.

I know that it’s in the Start function, but it’s because the GameObject whose have this script is activated for another script, this one:

using UnityEngine;
using System.Collections;
using UnityStandardAssets.CrossPlatformInput;

public class ShootM9 : MonoBehaviour {

    private Animator animacionDisparo;
    private bool isShooting;
    public GameObject shooter;

    void Start () {
        animacionDisparo = this.gameObject.GetComponent<Animator>();
        isShooting = false;
        shooter.SetActive(false);
    }
  
    void Update () {
        if (CrossPlatformInputManager.GetButtonDown("Shoot") && isShooting==false) {
            isShooting = true;
            shooter.SetActive(true);
            StartCoroutine("disparos");
        }
    }
    IEnumerator disparos() {
        animacionDisparo.enabled = true;
        yield return new WaitForSeconds(0.1666666f);
        animacionDisparo.enabled = false;
        shooter.SetActive(false);
        isShooting = false;
    }
}

I read other post of people who has the same problem that I, and the people said “There isn’t actually any master script or anything; the error is referring to that particular script.”.

I want to know if somebody can solve it and how.

Thank you very much :slight_smile:

2 
yield return new WaitForSeconds();

Cannot be run in an method by just calling it. You must place it in a coroutine and start it in the method itself I. But be warned, if you start a coroutine inside an update method, it’s just going to run the method 60+ times a second.

If you NEED to wait seconds you can create something like:

IEnumerator WaitSeconds(int seconds) {
    yield return new WaitForSeconds(seconds);
}

And then just start the coroutine in the Start(); method.

3

You are assigning a value to then Light variable ‘destello’ by accessing the gameObject.

You cant do this in the class declaration, you have to this at runtime.

Place ‘gameObject.GetComponent(Light)’ in Awake() or Start()

4

Thank for all, but nothing works, I think that I’m going to create a new diferent code.