Error in the command

Hello, I have a problem.

While doing the commands I came across an unwanted error.

Below:

[19:17:52] [Server thread/CRITICAL]: TypeError: "Return value of epCore\epCore:nCommand() must be of the type boolean, none returned" (EXCEPTION) in "plugins/epCore/src/epCore/epCore" at line 246
[19:17:52] [Server thread/DEBUG]: #0 src/pocketmine/command/PluginCommand(58): epCore\epCore->onCommand(pocketmine\command\ConsoleCommandSender object, pocketmine\command\PluginCommand object, string gracz, array Array())
[19:17:52] [Server thread/DEBUG]: #1 src/pocketmine/command/SimpleCommandMap(261): pocketmine\command\PluginCommand->execute(pocketmine\command\ConsoleCommandSender object, string gracz, array Array())
[19:17:52] [Server thread/DEBUG]: #2 src/pocketmine/Server(2030): pocketmine\command\SimpleCommandMap->dispatch(pocketmine\command\ConsoleCommandSender object, string gracz)
[19:17:52] [Server thread/DEBUG]: #3 src/pocketmine/Server(1615): pocketmine\Server->dispatchCommand(pocketmine\command\ConsoleCommandSender object, string gracz)
[19:17:52] [Server thread/DEBUG]: #4 vendor/pocketmine/snooze/src/SleeperHandler(123): pocketmine\Server->pocketmine\{closure}()
[19:17:52] [Server thread/DEBUG]: #5 vendor/pocketmine/snooze/src/SleeperHandler(85): pocketmine\snooze\SleeperHandler->processNotifications()
[19:17:52] [Server thread/DEBUG]: #6 src/pocketmine/Server(2349): pocketmine\snooze\SleeperHandler->sleepUntil(double 1549757872.5537)
[19:17:52] [Server thread/DEBUG]: #7 src/pocketmine/Server(2209): pocketmine\Server->tickProcessor()
[19:17:52] [Server thread/DEBUG]: #8 src/pocketmine/Server(1785): pocketmine\Server->start()
[19:17:52] [Server thread/DEBUG]: #9 src/pocketmine/PocketMine(249): pocketmine\Server->__construct(BaseClassLoader object, pocketmine\utils\MainLogger object, string /root/1/, string /root/1/plugins/)
[19:17:52] [Server thread/DEBUG]: #10 (1): require(string phar:///root/1/PocketMine-MP.phar/src/pocketmine/PocketMine.php)

Code:

public function onCommand(CommandSender $sender, Command $cmd, string $label, array $args) : bool{
if($cmd == "gracz"){
$nick = $sender->getName();
$this->data_smierc = new Config($this->getDataFolder() . "/smierci.yml", Config::YAML);
$smierc = $this->data_smierc->get($sender->getName());
if($smierc == null){
$smierc = 0;
}
$this->data_zabojstwa = new Config($this->getDataFolder() . "/zabojstwa.yml", Config::YAML);
$zabojstwo = $this->data_zabojstwa->get($sender->getName());
if($zabojstwo == null){
$zabojstwo = 0;
}
$this->data_odwiedziny = new Config($this->getDataFolder() . "/odwiedziny.yml", Config::YAML);
$odwiedziny = $this->data_odwiedziny->get($sender->getName());
$this->data_koxy = new Config($this->getDataFolder() . "/koxy.yml", Config::YAML);
$koxy = $this->data_koxy->get($sender->getName());
if($koxy == null){
$koxy = 0;
}
$this->data_refile = new Config($this->getDataFolder() . "/refile.yml", Config::YAML);
$refile = $this->data_refile->get($sender->getName());
if($refile == null){
$refile = 0;
}
$this->data_perly = new Config($this->getDataFolder() . "/perly.yml", Config::YAML);
$pearly = $this->data_perly->get($sender->getName());
if($pearly == null){
$pearly = 0;
}
$sender->sendMessage("§7• §8]------[ §aGRACZ§8 ]------[ §7•");
$sender->sendMessage("§8• §7Nick§8: §a" . $sender->getName() . " §8•");
$sender->sendMessage("§8• §7Zabojstwa§8: §a" . $zabojstwo . " §8•");
$sender->sendMessage("§8• §7Smierci§8: §a" . $smierc . " §8•");
$sender->sendMessage("§8• §7Zjedzone Koxy/Refy§8: §a" . $koxy . "/". $refile . " §8•");
$sender->sendMessage("§8• §7Rzucone Perly§8: §a" . $pearly . " §8•");
$sender->sendMessage("§8• §7Odwiedziny serwera§8: §a" . $odwiedziny . " §8•");
$sender->sendMessage("§7• §8]------[ §aGRACZ§8 ]------[ §7•");
}

if($cmd == "topka"){
$sender->sendMessage("§7• §8]------[ §aTOPKA GRACZY§8 ]------[ §7•");
$this->sendTop($sender);
$sender->sendMessage("§7• §8]------[ §aTOPKA GRACZY§8 ]------[ §7•");
}

if($cmd == "chat"){
if($sender->isOp()){
if(empty($args)){
$sender->sendMessage("§7• §8[§aTH§8] §7/chat on/off");
return true;
}

if($args[0] == "on"){
$this->disable = false;
$this->getServer()->broadcastMessage("§7• §8[§aTH§8] §7Chat został włączony!");
}

if($args[0] == "off"){
$this->disable = true;
$this->getServer()->broadcastMessage("§7• §8[§aTH§8] §7Chat został wyłączony!");
}
}else{
$sender->sendMessage("§7• §8[§aTH§8] §cBrak uprawnien do wykonania komendy!");
}
}

if($cmd == "cc"){
if($sender->isOp()){
for($i = 1; $i <= 75; $i++) {
$this->getServer()->broadcastMessage(" ");
}
$this->getServer()->broadcastMessage("§7• §8[§aTH§8] §7Chat został‚ wyczyszczony!");
}else{
$sender->sendMessage("§7• §8[§aTH§8] §cBrak uprawnien do wykonania komendy!");
}
}
}



Please help.
I'm sorry for my English.

 

Do like this:
onCommand(.............){
............... your commands ........
return false;
}