Why is Shurikan particle system variable textureSheetAnimation scripting not recognised?

I am trying to access the shurikan particle system's 'texture sheet animation' via script. From the Unity manual at http://docs.unity3d.com/ScriptReference/ParticleSystem-textureSheetAnimation.html , when I copy the code below:

 using UnityEngine;
 using System.Collections;
 
 public class ExampleClass : MonoBehaviour {
     void Start() {
         ParticleSystem ps = GetComponent<ParticleSystem>();
         var ts = ps.textureSheetAnimation;
             ts.enabled = true;
         ts.numTilesX = 2;
         ts.useRandomRow = true;
     }
 }

Unity produces an error:

Assets/SetParticleTexture.cs(51,29): error CS1061: Type UnityEngine.ParticleSystem' does not contain a definition for textureSheetAnimation' and no extension method textureSheetAnimation' of type UnityEngine.ParticleSystem' could be found (are you missing a using directive or an assembly reference?)

I am not sure why this is.. it doesn't produce a similar error if I, for example, address ParticleSystem.startRotation. Has anyone tried accessing textureSheetAnimation from script or know what I might be missing here?

Thanks for reading!