BCE0018: 'MovieTexture' does not denote a valid type ('not found').

I am making a game for android and have only just thought of adding a menu to it now. In the menu I have a movie playing on a plane, then I have guitextures acting as buttons. When I try and compile the game into an apk file it says “BCE0018: ‘MovieTexture’ does not denote a valid type (‘not found’).” in the console. Here is the script that the error is coming from:

#pragma strict

var movTexture : MovieTexture;

function Start () {
	GetComponent.<Renderer>().material.mainTexture = movTexture;
	movTexture.Play();
}

function Update () {

}

MovieTexture does not work on mobile (4.x dunno if they added it to 5). You need to use plugins.