[REQUEST] How to make several keys in on map

[Khan]

I think I messed up :|

////////////////////////////
// Run when entering map
void OnEnter()
{
AddUseItemCallback("", "chamberkey", "chamberdoor", "FUNCTION", true);
AddUseItemCallback("", "cellerkey", "cellerdoor", "FUNCTION", true);
AddEntityCollideCallback("Player", "script_slam", "func_slam", true, 1);
AddEntityCollideCallback("Player" , "doorbreak" , "MonsterFunc1" , true , 1);
AddEntityCollideCallback("Player", "doorslamtrigger1", "Func01", true, 1);
}
void FUNCTION(string &in "chamberkey", string &in "chamberdoor")
{
SetSwingDoorLocked("chamberdoor", false, true);
PlaySoundAtEntity("", "unlock_door", "door1", 0, false);
RemoveItem("chamberkey");
SetSwingDoorClosed("doorslam", true, true);
SetSwingDoorClosed("doorslam2", true, true);
}
void FUNCTION(string &in "cellerkey", string &in "cellerdoor"
{
SetSwingDoorLocked("cellerdoor", false, true);
PlaySoundAtEntity("", "unlock_door", "door1", 0, false);
RemoveItem("cellarkey);
}

I have like, no idea wat Im doing, so I tried wat I THOUGHT would work, it didint, now my game crashes when I try to start it ;(