Error : BCE0024

I am very new to scripting nad need help. Erro: Assets/Scripts/GameMaster.js(6,22): BCE0024: The type ‘UnityEngine.Rect’ does not have a visible constructor that matches the argument list ‘(float, int)’.

#pragma strict

static var currentScore : int = 0;

function OnGUI () {
	GUI.Box (new Rect (Screen.height*0.5, Screen.width/2), 200, 200, "score");
}

Please tell me exactly what I should do and what I should type!

Your line #6 to this:

GUI.Box(new Rect(parseFloat(Screen.height) * 0.5f, parseFloat(Screen.width) / 2f, 200f, 200f), "score");