How to fix animations

Questions & Answers
1

I have this script: 

function Update
{
     if(Input.GetButtonDown("Jump"))
     {
        var animationComp : Animation[] = GetComponentsInChildren(Animation);     
        for (var animComp : Animation in animationComp) 
        {         
            animComp.Play("grab sword");

        }
     }
}

I found this script so i could play an animation in the game objects child, and when i play and click space i get this error:

InvalidCastException: Cannot cast from source type to destination type. walker.Update () (at Assets\my scripts\walker.js:21)

How do i fix it so when i click space the animation plays?

2 
GetComponentsInChildren(Animation); ->  gameObject.GetComponentsInChildren(Animation);