Confusing Error

I am working on this game, and I keep getting this error, and the "coins" are not deleting themselvs like they should after I get the error. Thanks!

The Error Reads: Actor::updateMassFromShapes: Compute mesh inertia tensor failed for one of the actor's mesh shapes! Please change mesh geometry or supply a tensor manually! UnityEngine.Object:Instantiate(Object, Vector3, Quaternion) CoinCreater:CreateCoin() (at Assets/Resources/Scripts/CoinCreater.js:29)

Ignore the Commented parts on my script, they are for later.

 #pragma strict
 var xpos : float;
 var spawnpoint : Vector3;
 var coin : GameObject;
 var rotation : Quaternion;
 rotation.eulerAngles = new Vector3(0, 0, 0);
 var newCoin :Object;
 
 function Start () {
 InvokeRepeating("CreateCoin", 1, 1);
 }
 
 function Update () {
 Destroy(GameObject.FindWithTag("Coin"),10);
 }
 
 function CreateCoin(){
     xpos = Random.Range(-50.0,50.0);
     spawnpoint = new Vector3(xpos, 80, 0);
     
     var myColor : Color;                       // This is just working for another part of my script, Please Ignore.
     var mode : boolean = Random.value > 0.5f;
     var rand : float = Random.value;
     var index : int = Random.Range( 0, 3 ); 
     myColor[index] = rand;
     myColor[( index + ( mode ? 1 : 2 ) ) % 3] = 1;
     myColor[( index + ( mode ? 2 : 1 ) ) % 3] = 0;
     
     newCoin = Instantiate(coin, spawnpoint, rotation);
     //newCoin = newCoin as GameObject; 
     
 }