cant loadlevel on C#

using UnityEngine; using System.Collections;

public class MainMenu : MonoBehaviour {

 private string InstructionText = "Instructions:\nPress Left and Right Arrows to move.\nPress Spacebar to fire.";
 private int ButtonWidth = 200;
 private int ButtonHeight = 50;
 void OnGUI()
 {
     GUI.Label(new Rect(10, 10, 200, 200), InstructionText);
     if (GUI.Button(new Rect(10, 30, 200, 200), "Start Game"))
     {
   //###########THIS IS THE LINE I HAVING PROBLEM ################
         Application.loadedLevel(1);
     }
 }

}

UNITY GIVE ME THIS ERROR

Assets/Scrips/MainMenu.cs(15,25): error CS1955: The member UnityEngine.Application.loadedLevel cannot be used as method or delegate