error CS1501 no overload for method 'SetPosition' takes '1' argument, Unity Version 5.2

enter code here using UnityEngine; using System.Collections; using System.Collections.Generic;

public class Dibujar : MonoBehaviour {

 // Update is called once per frame
 void Update () 
 {
     if (Input.GetMouseButtonDown(0)) {
         StartCoroutine(dibujar());
     }
 }

 IEnumerator dibujar()
 {
     LineRenderer r = new GameObject ().AddComponent<LineRenderer> ();

     List<Vector3> posiciones = new List<Vector3>();

     while (Input.GetMouseButton(0))
     {
         posiciones.Add(Camera.main.ScreenToWorldPoint(Input.mousePosition));

         r.SetVertexCount(posiciones.Count);

         r.SetPosition(posiciones.ToArray());



         yield return new WaitForSeconds(0);
 
     }
 }

}