{SOLVED} Script Error: Item not Declared

[JenniferOrange]

void OnStart()
{
}
void OnEnter()
{
AddUseItemCallback("", "Closet_Key", "Closet_door","UsedKeyOnDoor",true);
}

void UsedKeyOnDoor(string &in asItem, string &in asEntity)
{
SetSwingDoorLocked("Closet_door", false, true);
PlaySoundAtEntity("", "unlock_door", "Closet_door", 0, false);
RemoveItem ("Closet_Key");
}


////////////////////////////
// Run when leaving map

void OnLeave()
{

}
The .lang is fine, though you've forgotten void OnStart() and putting quotes around the key name. Should work now!