Keys and Doors

[tehwhynot]

Yeah i watch a tutorial on how to use a key to open a door and this is the script:

////////////////////////////
//Run first time starting map
void OnStart()
{
AddUseItemCallback("", "key_1", "mansion_1", "UsedKeyOnDoor", true);
}
void UsedKeyOnDoor(string &in asItem, string &in asEntity)
{
SetSwingDoorLocked("mansion_1", false, true);
PlaySoundAtEntity("", "unlock_door", "mansion_1", 0, false);
RemoveItem("key_1");
}


I tried to copy everything exept run first time and voidOnstart and I got a ERROR.
Help me pls