I have a problem with my script

[Harrjannk]

Hey,
First thing: My English is bad. I hope you will understand me.
I'm new here and I'm currently working on my first custom story.
I tried, to make an area, where a sound would play, when the player walks into another area, but it doesn't work. When I walk into the area, nothing happens. I tried to solve it, but I can't see what's the problem.
Heres my script:

void OnStart()
{
AddEntityCollideCallback("Player", "ActivateLurker", "StartSound", true, 1);
}

void StartSound(string &in Entity)
{
PlaySoundAtEntity("StartSound", "water_lurker_idle.snt", "LurkerSound", 0, false);
}