Destroy gameobject

Hi all! I have a problem in a script I have. I used Destroy.gameObject with OnTriggerExit but it comes up with an error saying (Assets/Scripts/Random Messages/I see you.js(47,9): BCE0034: Expressions in statements must only be executed for their side-effects. ) How would I fix this? // Smothly open a door var smooth = 2.0; var DoorOpenAngle = 90.0; private var open : boolean; private var enter : boolean;

 private var defaultRot : Vector3;
 private var openRot : Vector3;
 
 function Start(){
 defaultRot = transform.eulerAngles;
 openRot = new Vector3 (defaultRot.x, defaultRot.y + DoorOpenAngle, defaultRot.z);
 }
 
 //Main function
 function Update (){
 if(open){
 //Open door
 transform.eulerAngles = Vector3.Slerp(transform.eulerAngles, openRot, Time.deltaTime * smooth);
 }else{
 //Close door
 transform.eulerAngles = Vector3.Slerp(transform.eulerAngles, defaultRot, Time.deltaTime * smooth);
 }
 
 if(Input.GetKeyDown("o") && enter){
 open = !open;
 }
 }
 
 function OnGUI(){
 if(enter){
 GUI.Label(new Rect(Screen.width/2 - 75, Screen.height - 100, 150, 30), "I see you");
 }
 }
 
 //Activate the Main function when player is near the door
 function OnTriggerEnter (other : Collider){
 if (other.gameObject.tag == "MainCamera") {
 enter = true;
 }
 }
 
 //Deactivate the Main function when player is go away from door
 function OnTriggerExit (other : Collider){
 if (other.gameObject.tag == "MainCamera") {
 enter = false;
 Destroy.gameObject;
 }
 }