animation not working

Hi, I'm making a 2d game. I want my player to open a door by pressing a button. I made a button script with a boolean called Open which becomes true when the player triggers the button. Then I wrote a door script saying that when the boolean open is true the anim Door should be played. Here is my script:

 var DoorAnim : AnimationClip;
 
 
 function Update()
 {
       if(buttonlevel2.Open == true)
     {
         animation.Play("DoorAnim");
         Debug.Log("Open");
     }
 }
 

The only problem is that when the boolean open is true the door anim doesn't work and this appears in the console:"the animation state dooranim could not be played because it couldn't be found". I even made a Debug.Log which works. I have also marked my animation as legacy. I hope you have understood and can help. Sorry for my bad english.