Index Out of Bounds Line Render

So i get an error on path.SetPosition (i, newPos); saying index is out of bounds? I am not sure why or how to solve this. the variable newPos is a vector 3 updated as the game object follows pose. I know its working because instantiate an object when The gameobject pose is moving. I can also print the current vector 3 of the Newpos. so why the error? I just want to build a line render as the object moves to then carry that over to the next scene, but cant get pass this error

Thanks for the help in advance.

     private Vector3 lastPos;
     private Vector3 newPos;
     private bool isMove;
     private int i;
     private LineRenderer path;
 
     public GameObject wayPoint;
     public GameObject pose;
 
     void Start ()
     {
         i = 0;
         path = GetComponent<LineRenderer> ();
         StartCoroutine (trackMove ());
     }
 
     IEnumerator trackMove()
     {
 
 
             lastPos = pose.transform.position;
             yield return new WaitForSeconds (0.5f);
             newPos = pose.transform.position;
             
 
             if (lastPos != newPos) {
                 Debug.Log ("Im moving");
                 path.SetVertexCount (i);
                 path.SetPosition (i, newPos);
                 i++;
             } 
             else if (lastPos == newPos) {
                 Debug.Log ("not moving);
                            isMove = false;
             }
             StartCoroutine (trackMove ());
     }