Solved How to get assassin?

Guys, how do I get the killer player? I tried to use

PHP:

$killer = $ev->getLastDamager();


but I did not succeed ...

My PHP is:

PHP:

public function onDeath(PlayerDeathEvent $ev){
    $vitima = $ev->getEntity();
    $assasino = $ev->getLastDamager();
    if($vitima instanceof Player && $assasino instanceof Player)    {
        $vitima->sendMessage(Loader::PREFIX." Você morreu§e ".$assasino->getName());
        $assasino->sendMessage(Loader::PREFIX." Você matou§e ".$vitima->getName());
    }
}


Error in console is:

Code:

[13:34:50] [♥PTK-KienPham♥-CRITICAL]: "Could not pass event 'pocketmine\event\player\PlayerDeathEvent' to 'WhinterCORE v1': Call to undefined method pocketmine\event\player\PlayerDeathEvent::getLastDamager() on WNCORE\Plugins\CustomAlerts\CustomAlerts
[13:34:50] [♥PTK-KienPham♥-CRITICAL]: Error: "Call to undefined method pocketmine\event\player\PlayerDeathEvent::getLastDamager()" (EXCEPTION) in "/WhinterCore PL/src/WNCORE/Plugins/CustomAlerts/CustomAlerts" at line 29

My line 29 is variable:

PHP:

$assasino = $ev->getLastDamager();


 

I didn't test it.

PHP:

public function onDeath(PlayerDeathEvent $ev){
    $cause = $ev->getLastDamageCause();
    if($cause instanceof EntityDamageByEntityEvent and $cause->getDamager() instanceof Player){
        $player = $ev->getPlayer();
        $damager = $cause->getDamager();
        $player->sendMessage(Loader::PREFIX." Você morreu§e ".$damager->getName());
        $damager->sendMessage(Loader::PREFIX." Você matou§e ".$player->getName());
    }
}

 

[
[21:02:55] [♥PTK-KienPham♥-CRITICAL]: "Could not pass event 'pocketmine\event\player\PlayerDeathEvent' to 'WhinterCORE v1': Call t o undefined method pocketmine\event\player\PlayerDeathEvent::getLastDamageCause() on WNCORE\Plugins\CustomAlerts\CustomAlerts
[21:02:55] [♥PTK-KienPham♥-CRITICAL]: Error: "Call to undefined method pocketmine\event\player\PlayerDeathEvent::getLastDamageCaus e()" (EXCEPTION) in "/WhinterCore PL/src/WNCORE/Plugins/CustomAlerts/CustomAlerts" at line 46


[

 

My plugins is working, i'm used other code.

Correct is:

PHP:

public function onDeath(PlayerDeathEvent $ev){
        $p = $ev->getPlayer();
        $cause = $p->getLastDamageCause();
        if($cause instanceof EntityDamageByEntityEvent){
            $killer = $cause->getDamager();
            $ev->setDeathMessage(Loader::PREFIX." §e".$p->getName()." §7foi morto(a) por§e ".$killer->getName());
        }else{
            $ev->setDeathMessage("");
        }
    }


 

I was gonna send u this too xd