Expected Identifier Error

[Cranky Old Man]

.. I'm still confused ;_; Can I just copy the entire code that I have onto here?

Are you just confused about how it should look, or is the code still not working after you corrected it?
The corrected code should look like this:

Code: (Select All)

OnStart()
{
  //AddUseItemCallback
  AddUseItemCallback("", "Key_1", "firstdoor1", "UsedKeyOnDoor", true);
}

void UsedKeyOnDoor(string &in asItem, string &in asEntity)
{
    SetSwingDoorLocked("firstdoor1", false, true);
    PlaySoundAtEntity("", "unlock_door", "firstdoor1", 0, false);
    RemoveItem("Key_1");
}