Please Help!

[EthanLancaster]

Here is my current script. Please help im so lost. It says cannot use item this way every time. Thanks in advance!

void OnStart ()
{
AddUseItemCallback("", "LibraryKey", "mansion_2", "KeyOnDoor", true);
AddEntityCollideCallback("Player", "StartPoint_Quest", "GetStartPoint", true, 1);
AddEntityCollideCallback("Player", "StartPoint_Quest", "FinishStartPoint", true, 1);
}
void KeyOnDoor(string &in asEntity)
{
SetSwingDoorLocked("mansion_2", false, true);
PlaySoundAtEntity("", "unlock_door", "mansion_2", 1, false);
RemoveItem("LibraryKey");
GiveSanityBoostSmall();
}

void GetStartPoint(string &in asParent, string &in asChild, int alState)
{
AddQuest("investigate","Investigate");
PlayGuiSound("react_breath_slow", 0.5f);
}

void FinishStartPoint(string &in asParent, string &in asChild, int alState)
{
CompleteQuest("investigate","Investigate") ;
GiveSanityBoostSmall();
}