error CS1061: Type `UnityEngine.LineRenderer' does not contain a definition for `numPositions' and no extension method `numPositions' of type `UnityEngine.LineRenderer' could be found

using System.Linq; using System.Collections.Generic; using UnityEngine;

public class Line : MonoBehaviour {

 public LineRenderer lineRenderer;
 public EdgeCollider2D edgeCol;

 List<Vector2> points;

 public void UpdateLine (Vector2 mousePos)
 {
     if (points == null)
     {
         points = new List<Vector2>();
         SetPoint(mousePos);
         return;
     }

     if (Vector2.Distance(points.Last(), mousePos) > .1f)
         SetPoint(mousePos);
 }

 void SetPoint (Vector2 point)
 {
     points.Add(point);

     lineRenderer.numPositions = points.Count;
     lineRenderer.SetPosition(points.Count - 1, point);

     if (points.Count > 1)
         edgeCol.points = points.ToArray();
 }

}

it just says numpositions doesnt exist, this is brackey's code but it doesnt work at all, i have the latest version of unity, is it only for the paid version?