Coroutine not working even when gameObject is active

Questions & Answers
1

I am making a player with a death animation, but whenever I call the animation it give me the error:

Coroutine couldn't be started because the the game object 'Player' is inactive!

This is my code for the animator:

IEnumerator Death()
    {
        yield return null;
        trans.SetTrigger("Death");
        yield return new WaitForSeconds(.2f);

        SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex);

    }
    // Start is called before the first frame update
    void Start()
    {
        gameObject.SetActive(true);
        rb = gameObject.GetComponent<Rigidbody2D>();
        
    }

Any help with this would be appreciated.

2

I’m wondering why gameObject.SetActive(true); located in Start method.
Start method will be invoked if the object is active. I mean that you don’t have to use SetActive(true); here.

I’m guessing you use coroutine on inactive object. If so, you have to activate a object by other object.
Please show me a whole code of yours.

3

Coroutine is not working automaticly when player gameobject on active. You need to start Coroutine:
https://docs.unity3d.com/ScriptReference/MonoBehaviour.StartCoroutine.html:

IEnumerator deathCor;    
IEnumerator Death()
     {
         yield return null;
         trans.SetTrigger("Death");
         yield return new WaitForSeconds(.2f);
 
         SceneManager.LoadScene(SceneManager.GetActiveScene().buildIndex);
 
     }
     // Start is called before the first frame update
     void Start()
     {
         deathCor = Death();
         StartCoroutine(deathCor);
         gameObject.SetActive(true);
         rb = gameObject.GetComponent<Rigidbody2D>();
         
     }
4

I ended up making the animation in a different way, but I realized that in that animation I was manipulating 4 child objects, they may have been inactive. I believe that activating them in the player’s start function would solve it, thanks to everyone that helped.