Gui now showing up! Nothing to do D':

Hi everyone, I'm having serous trouble with the GUI, I've been searching on google for hours and in this forum too, there are a lot of person that asked that before me but not one of them solution worked for me ): (like always) so, i'm here.

I have this script attached to my main camera:

 public class GuiControllerCamera : MonoBehaviour {
 
     // Use this for initialization
     void OnGui()
     {
         if (GUI.Button(new Rect(310, 180, 200, 30), "Restart Level"))
         {
 
             Application.LoadLevel(Application.loadedLevelName);
 
         }
 
         GUILayout.BeginArea(new Rect(50, 50, Screen.width / 2, Screen.height / 2));
         GUILayout.BeginHorizontal();
         if (GUILayout.Button("Restart Level"))
         {
             Application.LoadLevel(Application.loadedLevelName);
 
         }
         GUILayout.Label("Label");
         GUILayout.EndHorizontal();
         GUILayout.EndArea();
     }
 }

but in the game or in the scene during the debug the gui doesn't show up. Am i doing something wrong? 0.o Thank you in advance guys Soon (I'm in your hands! :P)