App get crash on animation of 2d object in Unity 4.3

Hi, Getting bit issue on playing animation when first object collide to second object its OnCollisionEnter2D method I am playing animation. I attached animation with second object and when I run code it gets crash. Here is what I am doing. declare string on top and call on collision. string blastAnim = "BlastAnim";

void OnCollisionEnter2D(Collision2D col){ Debug.Log("Collision Enter............."); animation.Play(blastAnim);

}