How do I fix the following error?

Here is my errorMissingMethodException: Method not found: ‘UnityEngine.GUI.Label’.
Boo.Lang.Runtime.DynamicDispatching.MethodDispatcherFactory.ProduceExtensionDispatcher ()
Boo.Lang.Runtime.DynamicDispatching.MethodDispatcherFactory.Create ()
Boo.Lang.Runtime.RuntimeServices.DoCreateMethodDispatcher (System.Object target, System.Type targetType, System.String name, System.Object args)
Boo.Lang.Runtime.RuntimeServices.CreateMethodDispatcher (System.Object target, System.String name, System.Object args)
Boo.Lang.Runtime.RuntimeServices+c__AnonStorey14.<>m__7 ()
Boo.Lang.Runtime.DynamicDispatching.DispatcherCache.Get (Boo.Lang.Runtime.DynamicDispatching.DispatcherKey key, Boo.Lang.Runtime.DynamicDispatching.DispatcherFactory factory)
Boo.Lang.Runtime.RuntimeServices.GetDispatcher (System.Object target, System.String cacheKeyName, System.Type cacheKeyTypes, Boo.Lang.Runtime.DynamicDispatching.DispatcherFactory factory)
Boo.Lang.Runtime.RuntimeServices.GetDispatcher (System.Object target, System.Object args, System.String cacheKeyName, Boo.Lang.Runtime.DynamicDispatching.DispatcherFactory factory)
Boo.Lang.Runtime.RuntimeServices.Invoke (System.Object target, System.String name, System.Object args)
UnityScript.Lang.UnityRuntimeServices.Invoke (System.Object target, System.String name, System.Object args, System.Type scriptBaseType)
Time.OnGUI () (at Assets/MyScripts/Time.js:12)

Sorry it is so long… here is the code that it is saying. I have no Idea what is wrong…

var FinalTime;
var buttonheight : int = 200;
var buttonwidth : int = 200;
function Start () 
{
	FinalTime = Timer.finalTime;
}

function OnGUI () 
{
	GUI.Box(Rect(1000, 400, buttonheight, buttonwidth), "Your Time");
	GUI.Label(Rect(100, 500, buttonheight, buttonwidth), "FinalTime");
}

You created this script in “Boo” language insted of JavaScript!