How to run a function in a GO that have DontDestroyOnLoad

The code i am using following

using UnityEngine; using System.Collections; public class CollisonWin : MonoBehaviour { GameObject goMAINMENU; public MainMenu MM; void OnTriggerEnter(Collider collision) { if (collision.gameObject.tag == "Player") { goMAINMENU = GameObject.Find("ScoreSystemCube"); MM = goMAINMENU.gameObject.GetComponent(); MM.SaveScore(); Debug.Log("Winning!"); Application.LoadLevel("2DKemi_Level2"); } } }

SaveScore

 using UnityEngine;
 using System.Collections;
 
 public class ScoreSystem : MonoBehaviour {
     public int score;
     public GUISkin Scoreskin;
     public bool saveScoreSetting;
 
     GameObject goMAINMENU;
     public MainMenu MM;
 
     public void ToggleScore()
     {
 
         goMAINMENU = GameObject.Find("ScoreSystemCube");
         MM = goMAINMENU.gameObject.GetComponent<MainMenu>();
 
         saveScoreSetting = MM.WhatModeIsIt();
 
         if (Application.loadedLevelName == "2DKemi_Level1")
         {
             
             
             if (saveScoreSetting == true)
             {
                 //ADD points 
                 score = 0;
             }
             if (saveScoreSetting == false)
             {
                 //LOSE points
                 score = 500;
             }
         }
         if (Application.loadedLevelName == "2DKemi_Level2")
         {
             if (saveScoreSetting == true)
             {
                 //ADD points
                 score = 0;
             }
             if (saveScoreSetting == false)
             {
                 //LOSE points
                 score = 1000;
             }
 
         }
 
     }
 
 
     public void AdjustScore(int adj)
     {
         if (saveScoreSetting == true)
         {
             if (adj < 0)//om minus poäng, sätt till 0;
             {
                 adj = 0;
             }
         }
         if (saveScoreSetting == false)
         {
             if (adj > 0)//om plus poäng, sätt till 0;
             {
                 adj = 0;
             }
         }
 
         if (score < 0)
         {
             score = 0;
         }
         else
         {
             score = score + adj;
         }
     }
 
     void OnGUI()
     {
         float InfoBoxWidth = (Screen.width * 0.15f);
         float InfoBoxheight = (Screen.height * 0.10f);
         float scoreBarLengthLock = (Screen.width / 4);
 
 
         GUI.skin = Scoreskin;
 
 
         GUI.Box(new Rect(Screen.width - (scoreBarLengthLock + 10), Screen.height - 32, (InfoBoxWidth*1.8f), InfoBoxheight), " ");
         GUI.Box(new Rect(Screen.width - (scoreBarLengthLock + 10), Screen.height - 32, (InfoBoxWidth*1.8f), InfoBoxheight), "Poäng: " + score);
 
 
 
         
 
     }
 
     void Start () {
         ToggleScore(); // CHANGES SCORE SYSTEM TO POSITIVE OR NEGATIVE
     }
     
     // Update is called once per frame
     void Update () {
         if (score < 0)
         {
             score = 0;
         }
     }
 }

MainMenu

 using UnityEngine;
 using System.Collections;
 
 public class MainMenu : MonoBehaviour {
 
     GameObject goPLAYER;
 
     public bool ChoosenMode;
 
     public int[] SavedScore = new int[10]; //totalpoäng i 0, poäng för bana 1 i 1, bana 2 i 2 osv.
 
     public GUISkin Scoreskin;
     public ScoreSystem SS;
 
     float InfoBoxwidth = (Screen.width * 0.15f);
     float InfoBoxheight = (Screen.height * 0.10f);
 
     float scoreBarLengthLock = (Screen.width / 4);
     
     void OnGUI()
     {
         if (Application.loadedLevelName == "Start_Menu")
         {
             GUI.skin = Scoreskin;
             if (GUI.Button(new Rect(((Screen.width / 2) - (InfoBoxwidth + 10)), ((Screen.height / 2) - (InfoBoxheight / 2)), InfoBoxwidth, InfoBoxheight), "+"))
             {
                 ChoosenModeFunction(true);
                 Application.LoadLevel("2DKemi_Level1");
 
             }
             if (GUI.Button(new Rect(((Screen.width / 2) + 10), ((Screen.height / 2) - (InfoBoxheight / 2)), InfoBoxwidth, InfoBoxheight), "-"))
             {
                 ChoosenModeFunction(false);
                 Application.LoadLevel("2DKemi_Level1");
             }
 
         }
     }
 
 
     void ChoosenModeFunction(bool Choosen_feedback)
     {
         ChoosenMode = Choosen_feedback;
         print("THE CHOSEN MODE IS: " + ChoosenMode);
     }
 
     public bool WhatModeIsIt()
     {
         return (ChoosenMode);
     }
 
     public void SaveScore()
     {
         int scoreToSave;
         scoreToSave = SS.score;
         if (Application.loadedLevelName == "2DKemi_Level1")
         {
             SavedScore[1] = scoreToSave;
             SavedScore[0] = SavedScore[0] + scoreToSave;
             print("PLAYER GOT THIS SCORE LAST MAP: " + scoreToSave);
         }
 
         if (Application.loadedLevelName == "2DKemi_Level2")
         {
             SavedScore[2] = scoreToSave;
             SavedScore[0] = SavedScore[0] + scoreToSave;
             print("PLAYER GOT THIS SCORE LAST MAP: " + scoreToSave);
         }
     }
 
     void awake()
     {
 
         //DontDestroyOnLoad(this);
         DontDestroyOnLoad(transform.gameObject);
         goPLAYER = GameObject.Find("First Person Controller");
         SS = goPLAYER.gameObject.GetComponent<ScoreSystem>();
         SS.ToggleScore();
 
         print("THE CHOSEN MODE IS: " + ChoosenMode);
 
     }
     
     void Start () {
     
     }
     
     // Update is called once per frame
     void Update () {
     
     }
 }

This is seposed to findout when the player collide whit this objektive to make it a "goal" and then load the next map.

but before this i have had a simple script in the start that chooses if the game will use positive or negative feedback. this is then stored in that GO.

in the same file i have a "save score" kind of function that saves the games score to an array

Error: NullReferenceException: Object reference not set to an instance of an object MainMenu.SaveScore () (at Assets/Standard Assets/Scripts/Scripts/MainMenu.cs:55) CollisonWin.OnTriggerEnter (UnityEngine.Collider collision) (at Assets/Standard Assets/Scripts/Scripts/CollisonWin.cs:26)

as the go does not show up, but its still active, it reconnaissances it as null

PS: c# please :)