** SOLVED ** No sound when unlocking door?

[FurtherGames]

Hello. Everything inside my first map is working perfectly, apart from the sound that is supposed to play when I insert a key into a swing door. The door does unlock, but no sound is heard.

HPS File:

void OnStart()
{
AddUseItemCallback("", "Key1", "masion_Door", "DoorUnlockKey", true);
}

void OnEnter()
{

}

void OnLeave()
{

}
void DoorUnlockKey(string &in asItem, string &in asEntity)
{
SetSwingDoorLocked("masion_Door", false, true);
PlaySoundAtEntity("unlock.door.snt", "unlock_door", "masion_Door", 150, false);
RemoveItem("Key1");
}