You are not allowed to call this function when declaring a variable

Hello Unity Community, i have an Error that messes my builded game up with a report message, so heres the error i’v got:

UnityException: You are not allowed to call this function when declaring a variable.
Move it to the line after without a variable declaration.
If you are using C# don’t use this function in the constructor or field initializers, Instead move initialization to the Awake or Start function.
Pause Controller…ctor () (at Assets/Scripts/Pause Controller.js:2)

and heres the script the error comes from:

var menuHeight:float=500;
var menuWidth:float=500;
var buttonSpacing:float=25;
var mainMenu: String = "MainMenu";
var titleTexture:Texture2D;
var customSkin:GUISkin;
var customStyle:GUIStyle;
var Player: MouseLook = GetComponent(MouseLook);
var MainCamera: MouseLook = GetComponent(MouseLook);

function OnGUI(){
	GUI.skin = customSkin;
	GUILayout.BeginArea(Rect(Screen.width/2-menuWidth/2,Screen.height/2-menuHeight/2,menuHeight,menuWidth),customStyle);
	GUILayout.Space(50);
	GUILayout.Label(titleTexture);
	GUILayout.Space(buttonSpacing);
	Time.timeScale=0;
	Screen.showCursor = true;
	Player.GetComponent(MouseLook).enabled = false;
	MainCamera.GetComponent(MouseLook).enabled = false;
	if(GUILayout.Button("Resume Game")){
		gameObject.GetComponent(PauseMenu).enabled = false;
		Time.timeScale=1;
		Screen.showCursor = false;
		Player.GetComponent(MouseLook).enabled = true;
		MainCamera.GetComponent(MouseLook).enabled = true;
	}
	GUILayout.Space(buttonSpacing);
	if(GUILayout.Button("Exit to Desktop")){
		Application.Quit();
	}
	GUILayout.Space(buttonSpacing);
	GUILayout.EndArea();
}

i really hope to get this thing solved. thanks in advance ^^

Replace those two lines:

var Player: MouseLook = GetComponent(MouseLook);
var MainCamera: MouseLook = GetComponent(MouseLook);

with those:

var Player: MouseLook;
var MainCamera: MouseLook;
function Start()
{
    Player = GetComponent(MouseLook);
    MainCamera = Player;
}

Also you don’t need to get the component again and again. In OnGUI just do

Player.enabled = false;

btw what’s the point of having two variables holding the same component? It seems you set them both at the same time which makes zero sense.

I guess you simply should remove all GetComponent calls and assign your references in the inspector.