Concat() for Lists

I’ve got a list called GhostObjects:

private var GhostObjects : List.<GameObject> = List.<GameObject>();

There are either two types of ghosts in the scene, big ones and small ones:

function Start () {
    GhostObjects = GameObject.FindGameObjectsWithTag("BigGhost").Concat(GameObject.FindGameObjectsWithTag("SmallGhost")).ToArray();
}

The error I’m getting, is that it cannot convert:

UnityEngine.GameObject[] to System.Collections.Generic.List<UnityEngine.GameObject>

How do I resolve this error?

Thanks!

Solved it!

All I had to was replace .ToArray() into .ToList()!