Playerprefs not work!?

Hi everyone. I have a problem. I make a runner game and now I want to make a script that will show my current score. But when I play my game it doesn't show me my current score. It shows this "Score: 0" everytime. What did I do wrong?? Here my score script:

     function Start(){
     InvokeRepeating("EachSecond",1.0,1.0);
     }
      
     var score: int = 0;
     var addscore = 1;
     var score1 : GUIText;
     var bim : GameObject;
      
     function EachSecond()
     {
     score=score+addscore;
     }
     function Update()
     {
     score1.text = "Score: " + score;
     
     }
    
     function GameOver(){
         PlayerPrefs.SetInt("Score", score );
     }

and here my final score script:

 #pragma strict
 
 private var score : int = 0;
 var scoreText : GUIText;
 
 function Start() {
 score = PlayerPrefs.GetInt("Score");
 }
 
 function Update () {
 scoreText.text = "Score: " + score;
 //GUI.Label(new Rect(Screen.width / 2 - 40,30 ,80 ,300), "Score: " + score);
 }

Please help me and sorry for my bad english.