My game crashes when I use GUI in scripts...

The title pretty much explains itself, but here's all the code i have right now...
(When It loads the scene, the game just restarts itself...)

Code (csharp):

1.  
2. using UnityEngine;
3. using System.Collections;
4.  
5. public class Mechanics : MonoBehaviour {
6.    public int bloodDrops = 0;
7.    public int teeth = 0;
8.    public int money = 100;
9.  
10.    public GUISkin skin;
11.  
12.    public void Awake() {
13.      LoadData();
14.    }
15.  
16.    public void SaveData() {
17.    
18.    }
19.  
20.    public void LoadData() {
21.    
22.    }
23.  
24.    public void OnGUI() {
25.      GUI.skin = skin;
26.      GUI.Box(new Rect (0, 0, Screen.width, Screen.height), "", "GameBox");
27.      GUI.Box(new Rect(Screen.width / 2 - Screen.width / 4, 0, Screen.width / 2, Screen.height / 8), "", "HeaderBox");
28.    }
29. }
30.  
31.  

 

You just one scene? or loadlevel from other scene?