Script for play parent gameobject animation

Hi everyone.

i created 3 cube, and added them as child to an empty gameobject. then in unity editor i animated that gameobject,unity added animator component. now i wanna control and access to play and stop this animation with js script.and i dont know how i can do it.i searched all the day to find a way.please help me :)

all the time i have this error :

The animation state Boileran0 could not be played because it couldn't be found!

     var boiler0 : GameObject;
     var Boileran0 : AnimationClip;
     
     function Start () {
     
     }
     
     function Update () {
     
         if (Input.GetMouseButton(0)){
          boiler0.animator.CrossFade("Boileran0");
         }
         
     }