CreateParticleSystem not working

[Damascus]

I've created a ScriptArea that i want to produce a whirl of dust. When the player completes a puzzle, they hear a roar in the distance, and a whirl of dust blows out the nearby torches. I've called the ScriptArea "WhirlArea," and here's the script I have set up:

Spoiler below!

(at the end of the function that solves the puzzle)
AddTimer("groan", 5, "Timer_Machine1");
AddTimer("whirl", 5.5, "Timer_Machine1");
AddTimer("lightsout", 6, "Timer_Machine1");

void Timer_Machine1(string &in asTimer)
{
if(asTimer == "groan")
{
PlaySoundAtEntity("", "11_guardian_idle", "GroanArea", 2.0f, false);
}
else if(asTimer == "whirl")
{
CreateParticleSystemAtEntity("", "ps_dust_whirl", "AreaWhirl", false);
}
else if(asTimer == "lightsout")
{
SetLampLit("torch_static01_29", false, true);
SetLampLit("torch_static01_30", false, true);
FadeLightTo("PointLight_14", 0, 0, 0, 0, 0, 1);
}
}

The sound plays, and the lights go out, but there is no whirl of dust. Any reason why this might be happening?