join effect

Hi, TonyDroidd and I, have been trying to make a join effect plugin, but we tried many function and none of them work. Here's one of the ones I tried.

PHP:

    public function onJoin(PlayerJoinEvent $event) {
         $p = $event->getPlayer();
             $cfg = $this->getConfig()->getAll();
              $effect = Effect::getEffectByName($cfg["Effect Name"]);
              $effect->setVisible(true);
              $effect->setDuration(1200);//ticks
              $p->addEffect($effect);
}

He's asking lots of people.

But I also need it

Hey @Falk ,can you help us?
https://github.com/TonyDroidd/JoinEffect

Maybe its not supported yet I will try a new event