[SCRIPT] Particle Effects help

[Smackdown]

What's not working? is the whole function not working, or do you not see the particle system?

The particle system will play in the center of a script area (ScriptArea_4), basically where you see the words "AREA" in the editor. Make sure the words are in the map itself so you can see it, and that the center of the area is not, say, under the floor.

When I have in the script "SetEntityActive("ParticleSystem_17", true);" and in the editor the particle effect is not active I can start the game and play the map, but Nothing happens there, no particle effect.
When I have something like that "CreateParticleSystemAtEntity("E1PS", "ps_debris_tunnel.ps", "ScriptArea_4", true);" and I want to start the custom story an error shows up.