Script Is Working But Animation Isn't

Hi there.
I have a building project imported from 3D Studio Max. I have animations and scripts ready. It’s a simple animation & script : Opening a door.
The animation and script are both working in another unity project. But in this imported project I can’t open the door.

I also tried:
Created an empty cube, set its renderer off and shaped it like my imported door. Then make the “imported door” of that cube’s child. And when I tried that this time the door’s collider opens, I can go through the door, but the door’s graphics don’t move at all.

I’ll be glad if anybody help me. Thanks.

Ok. Here is the script I use. As I said before it works in another project.

` public Animation door = null;

void Start()
{
    if (door == null)
        Destroy(this);
}
void OnTriggerEnter(Collider obj)
{
    if (obj.tag == "Player")
    {
        door.Play("OpenDoor");
        Destroy(this);
    }
}`