GUI button not working

Questions & Answers
1

I am getting a null exception error with the following code: void onGUI(){

	Debug.Log ("fly");
	//GUI.Button(new Rect(20,40,80,20), "Level 1");
	//GUI.Button (new Rect (20, 50, 300, 40), "Start game");
	if(GUI.Button (new Rect(50, 100, 20, 10), "Start game")){
		Application.LoadLevel("terrain for car");
		//reloads the level called terrain for car
	}
	
	//if(GUI.Button (new Rect(500,50,300,40), "Quit")){
	//	Debug.Log("End");
	//	Application.Quit();
		//ends the game
	//}
	}
2

Null Exception error? You shoudn’t even be getting any GUI on the screen because its OnGUI() and not onGUI().

3

Check the name of the level and make sure it is in the build settings (File → Build settings).