Solved Call to a member function setUsage() on nul

Hi, i dont know what the error is
I only got
[Server thread/CRITICAL]: Error: "Call to a member function setUsage() on null" (EXCEPTION) in "/plugins/KEJURPG1/src/test/Main" at line 64

PHP:

public function onEnable()
{
    $this->saveDefaultConfig();
    $this->reloadConfig();
    $this->saveResource("messages.yml", false);

    $messages = (new Config($this->getDataFolder() . "messages.yml"))->getAll();

    $this->messages = $this->parseMessages($messages);

    $registerCommand = $this->getCommand("register");
    $registerCommand->setUsage($this->getMessage("register.usage"));
    $registerCommand->setDescription($this->getMessage("register.description"));
    $registerCommand->setPermissionMessage($this->getMessage("register.permission"));

    $loginCommand = $this->getCommand("login");
    $loginCommand->setUsage($this->getMessage("login.usage"));
    $loginCommand->setDescription($this->getMessage("login.description"));
    $loginCommand->setPermissionMessage($this->getMessage("login.permission"));

    $this->blockPlayers = (int)$this->getConfig()->get("blockAfterFail", 6);

    $provider = $this->getConfig()->get("dataProvider");
    unset($this->provider);
    switch (strtolower($provider)) {
        case "yaml":
            $this->getLogger()->info("Using YAML data provider");
            $provider = new YAMLDataProvider(new SimpleAuth());
            break;
        case "sqlite3":
            $this->getLogger()->info("Using SQLite3 data provider");
            $provider = new SQLite3DataProvider(new SimpleAuth());
            break;
        case "mysql":
            $this->getLogger()->info("Using MySQL data provider");
            $provider = new MySQLDataProvider(new SimpleAuth());
            break;
        case "none":
        default:
            $provider = new DummyDataProvider(new SimpleAuth());
            break;
    }
}


private function parseMessages(array $messages){
    $result = [];
    foreach($messages as $key => $value){
        if(is_array($value)){
            foreach($this->parseMessages($value) as $k => $v){
                $result[$key . "." . $k] = $v;
            }
        }else{
            $result[$key] = $value;
        }
    }

    return $result;
}

public function getMessage($key){
    return isset($this->messages[$key]) ? $this->messages[$key] : $key;
}


This post maybe a facepalm post . but, i need help, so i post it here

 

I Forgot To Register IT *facepalm