Solved I think it's a serious error. Please fix this error.

Error:
2019-07-07 [22:47:19.699] [Server thread/CRITICAL]: Error: "Call to undefined method pocketmine\event\server\DataPacketReceiveEvent::getPlayer()" (EXCEPTION) in "plugins/FPS/src/LEADTV/FPS/FPS" at line 322
2019-07-07 [22:47:19.699] [Server thread/DEBUG]: #0 src/pocketmine/event/RegisteredListener(88): LEADTV\FPS\FPS->onReceive(object pocketmine\event\server\DataPacketReceiveEvent)
2019-07-07 [22:47:19.700] [Server thread/DEBUG]: #1 src/pocketmine/event/Event(67): pocketmine\event\RegisteredListener->callEvent(object pocketmine\event\server\DataPacketReceiveEvent)
2019-07-07 [22:47:19.701] [Server thread/DEBUG]: #2 src/pocketmine/network/mcpe/NetworkSession(342): pocketmine\event\Event->call()
2019-07-07 [22:47:19.701] [Server thread/DEBUG]: #3 src/pocketmine/network/mcpe/NetworkSession(309): pocketmine\network\mcpe\NetworkSession->handleDataPacket(object pocketmine\network\mcpe\protocol\ModalFormResponsePacket)
2019-07-07 [22:47:19.702] [Server thread/DEBUG]: #4 src/pocketmine/network/mcpe/raklib/RakLibInterface(151): pocketmine\network\mcpe\NetworkSession->handleEncoded(string[42] x.SN.4.U.Z....\[email protected]..)
2019-07-07 [22:47:19.702] [Server thread/DEBUG]: #5 vendor/pocketmine/raklib/src/server/ServerHandler(102): pocketmine\network\mcpe\raklib\RakLibInterface->handleEncapsulated(integer 0, object raklib\protocol\EncapsulatedPacket, integer 0)
2019-07-07 [22:47:19.702] [Server thread/DEBUG]: #6 src/pocketmine/network/mcpe/raklib/RakLibInterface(95): raklib\server\ServerHandler->handlePacket()
2019-07-07 [22:47:19.703] [Server thread/DEBUG]: #7 vendor/pocketmine/snooze/src/SleeperHandler(123): pocketmine\network\mcpe\raklib\RakLibInterface->pocketmine\network\mcpe\raklib\{closure}()
2019-07-07 [22:47:19.703] [Server thread/DEBUG]: #8 vendor/pocketmine/snooze/src/SleeperHandler(85): pocketmine\snooze\SleeperHandler->processNotifications()
2019-07-07 [22:47:19.703] [Server thread/DEBUG]: #9 src/pocketmine/Server(1776): pocketmine\snooze\SleeperHandler->sleepUntil(double 1562505439.7305)
2019-07-07 [22:47:19.703] [Server thread/DEBUG]: #10 src/pocketmine/Server(1307): pocketmine\Server->tickProcessor()
2019-07-07 [22:47:19.704] [Server thread/DEBUG]: #11 src/pocketmine/PocketMine(275): pocketmine\Server->__construct(object BaseClassLoader, object pocketmine\utils\MainLogger, string[27] C:\Users\0w0\Desktop\MoonX\, string[35] C:\Users\0w0\Desktop\MoonX\plugins\)

Source:

public function onReceive(DataPacketReceiveEvent $event){
$packet = $event->getPacket();
if($packet instanceof ModalFormResponsePacket){
if ($packet->formId == 86002){
$data = json_decode($packet->formData, true);
if(is_null($data)) return true;
$player = $event->getPlayer();
$name = strtolower($player->getName());
$this->receive($player, 86002, $data);
}
}
}
public function receive(Player $player, $formId, $data){
$name = $player->getName();
if ($formId === 86002){
if ($data[0] == null || $data[1] == null || $data[2] == null || $data[3] == null || $data[4] == null || $data[5] == null){
$player->addTitle("§c§l✗", "§f제대로 입력 해주세요.");
//$player->getWorld()->addSound(new ClickSound(new Vector3($player->getX(), $player->getY(), $player->getZ())));
}
if ($data[4] == false){
$data[4] = "X";
} else {
$data[4] = "O";
}

$this->db["guns"][$data[0]] = [];
$this->db["guns"][$data[0]]["name"] = $data[0];
$this->db["guns"][$data[0]]["max"] = (int) $data[2];
$this->db["guns"][$data[0]]["tier"] = $data[1];
$this->db["guns"][$data[0]]["return"] = (int) $data[3];
$this->db["guns"][$data[0]]["multi"] = $data[4];
$this->db["guns"][$data[0]]["shoot"] = (int) $data[5];
$this->save();

$it = $this->db["guns"][$data[0]];

$item = $player->getInventory()->getItemInHand();

$lore = $item->getLore();
$lore[] = "§a≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡";
$lore[] = "§f• §c이름: §f".$it["name"];
$lore[] = "§f• §c등급: §f".$it["tier"];
$lore[] = "§f• §c연발 여부: §f".$it["multi"];
$lore[] = "§f• §c최대 탄창: §f".$it["max"]." 발";
$lore[] = "§f• §c장전 시간: §f".$it["return"]." 초";
$lore[] = "§a≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡≡";

$item->setNamedTagEntry(new StringTag(self::NAMED_TAG, $data[0]));
$item->setLore($lore);
$player->getInventory()->addItem($item);
//$player->getWorld()->addSound(new TotemUseSound(new Vector3($player->getX(), $player->getY(), $player->getZ())));
$player->addTitle("§a§l√", "§f성공적으로 실행 되었습니다.");
}
}