javascript object creation and "n is undefined"

Hello,

I'm tryng to create an object wich holds mine ground in a scene, I'm using this code but it doesn't works, in console I receive a "n is undefined" message.
But with the vector creation, for example, there's no problems....

 

var terreno = {
	
    noiseTexture : "media/noise2.jpg",
    distortAmount : 10,
    offset : -20,
	
    xmin : -200,
    zmin : -200,
    xmax :  200,
    zmax :  200,
    precision : {
        "w" : 80,
        "h" : 80
    },
    subdivisions : {
        'h' : 1,
        'w' : 1
    },
    // Create the Tiled Ground
    create : new function(name, scene) { //"Tiled Ground"
    	this.scene = scene;
    	this.name = name;
    	
    	this.v = new BABYLON.Vector3(1, 10, 0);
    	this.tiledGround = new BABYLON.Mesh.CreateTiledGround(name, this.xmin, this.zmin, this.xmax, this.zmax, this.subdivisions, this.precision, scene);
    	
    }
    
    
};