Problem with the Playerprefs

Hi
I make a game and now I want to add a score but it doesn’t work with the Playerprefs
Everytime when I write this it says GetInt is not a member of Playerprefs.

var score : int = 0;
var scoreText : GUIText;

function Start(){
    score = PlayerPrefs.GetInt("Score");
}
function Update() {
    scoreText.text = "Score: " + score;
}

this is what i use to get my score (its in c# tho) :

using UnityEngine;
using System.Collections;

public class GetHighScore : MonoBehaviour {
	public TextMesh highScoreText ;
	public GUIText highScoreGuiText ;
	private int score;
	private string setScore;

	public bool GuiScore = false;

	// Use this for initialization
	void Awake () {
		score = PlayerPrefs.GetInt ("highScore");
		setScore = score.ToString("f0");
		if (GuiScore == false) 
		{
						highScoreText.GetComponent<TextMesh> ().text = "personal best : " + setScore + " points";
						
		} 
		if (GuiScore == true)
		{
			highScoreGuiText.GetComponent<GUIText> ().text =  setScore + " points";
		}

	}
	

}

and this is what i use to set it :

if (newScoreI > PlayerPrefs.GetInt("highScore"))
			{
				PlayerPrefs.SetInt("highScore",(newScoreI ));
			}