FadeOut script getting error

The script below fades out to black when you press a key, and loads a level. It works, but I receive these two errors. Also, if I have the level to be loaded opened initially I do not receive the error, which further confuses me. Thanks guys.

Code:

Code (JavaScript):

1.  #pragma strict
2. // FadeInOut
3. // Variables
4. var fadeTexture : Texture2D;
5. var fadeSpeed = 0.2;
6. var drawDepth = -1000;
7.  
8. // On off switch variable
9. var fadeOut : boolean = false;
10.  
11. private var alpha = 0.0;
12. private var fadeDir = -1;
13. function Start ()
14. {
15.     fadeOut = false;
16. }
17. function Update ()
18. {
19.     if (Input.GetKeyDown("f") && loadLevel == true)
20.     {
21.         //Load Level
22.         LoadLevel();
23.     }
24.  
25. }
26. function OnGUI(){
27.     // Fade out and load outdoor level
28.     if (fadeOut == true)
29.     {
30.         // Fade Out
31.         alpha -= fadeDir * fadeSpeed * Time.deltaTime;
32.         alpha = Mathf.Clamp01(alpha);
33.         GUI.color.a = alpha;
34.         GUI.depth = drawDepth;
35.    
36.         GUI.DrawTexture(Rect(0, 0, Screen.width, Screen.height), fadeTexture);
37.      
38.     }
39. }
40.  
41. var loadLevel : boolean = true;
42.  
43. function LoadLevel()
44. {
45.     fadeOut = true;
46.     loadLevel = false;
47.     yield WaitForSeconds (1);
48.     Application.LoadLevel("Scene_1_2048");
49. }

Errors:
1.
GetLocalizedString can only be called from the main thread.
Constructors and field initializers will be executed from the loading thread when loading a scene.
Don't use this function in the constructor or field initializers, instead move initialization code to the Awake or Start function.
2.
ArgumentException: GetLocalizedString can only be called from the main thread.
Constructors and field initializers will be executed from the loading thread when loading a scene.
Don't use this function in the constructor or field initializers, instead move initialization code to the Awake or Start function.
TreeEditor.TreeGroupRoot..cctor ()
Rethrow as TypeInitializationException: An exception was thrown by the type initializer for TreeEditor.TreeGroupRoot

 

the moment you used javascript...(insert text here)

 

It sounds like its an editor issue. that main thread buisness is ushually a product of something happening within a finalizer or using something like initializing a variable to Camera.current or some other unity class.

Whats the stack trace of the error?