Getcomponent Javascript error

Hello so im new to java script, and get this error No appropriate version of 'UnityEngine.Component.GetComponent' for the argument list '(function(): void)' was found.

im trying to get the "money" var from the the Main script to use in my Store script.

Here is my codes:

First one:(called Main)

 #pragma strict
 var clicks : GameObject;
 var totalclicks : GUIText;
 var moneytext : GUIText;
 var clicked : boolean = false;
 var click : int = 0;
 public static var money : int = 0;
 function Start () {
 click = 0;
 money = 0;
 
 }
 
 function Update () {
 totalclicks.text = "Total Weeds: " + click;
 moneytext.text = "Weed Money: " + money;
 
 }
 
 function OnMouseDown()
 {
 click += 1;
 money += 1;
 }
 
 ------------------------
 Second one(called Store):
 #pragma strict
 var factoryt : GUIText;
 var factory : int = 0;
 
 private var mainScript : Main;
 
 function Awake (){
 mainScript = GetComponent(Main);
 
 }
 
 function Start () {
 factory = 0;
 }
 
 function Update () {
 factoryt.text = "Factory: " + factory;
 }
 
 function OnMouseDown(){
 if(mainScript.money >= 100){
 factory += 1;
 mainScript.money -= 100;
 }
 
 }