Bullet Prefab not instantiating

var BulletPrefab:GameObject;
var force : float = 2000;

function OnGUI()
		if (GUI.Button(Rect(250,350,75,75),"")) 
			var bullet = Instantiate(BulletPrefab, 
 			bullet.rigidbody.AddForce(bullet.transform.forward * force);

I created a button that’s supposed to instantiate and give a forward force to a bullet game object - but whenever I press it, the game object appears in the inspector but not actually on the game screen, can anybody tell me how to fix it?

Add the Rigid Body and uncheck use gravity in it, it will work. I did the same in my game forgot to add the Rigidbosy