StartCoroutine() is detecting my class as null

I have a class called LR which I want to use Coroutines. But upon trial i found that it was detecting my class as null. This is all I have in my coroutine right now and it still does not work.

 public void Start(){
      StartCoroutine(MyCoroutine());
 }
 
 IEnumerator MyCoroutine(){
      Debug.Log("Start Coroutine");
      yield return new WaitForSeconds(2)
 }

I declared and instantiated LR in my GameManager script as follows:

 listRecall =  (new GameObject("ListRecallController")).AddComponent<LR>();
 listRecall = new LR(this);

This is the error i got on the visual studio debugger