It's an quick FX, if you don't use it in loop, then it play only 1 second (it's how like a light), and I want to play it in loop, so there shouldn't show only 1 secound.
I think carepackage_friendly = playLoopedFx( level._effect["carepackage_friendly"], 1.0, self.origin ); is why that doesn't work. The FX does exist, the path is correct.
I will ask other guys now too, maybe they know how it can work.