How to set command usage?

So, I have made a command that when the first argument is server or ranks it shows you a message. I want to make it to show a message when there are no arguments but I get errors on the console. Here is my code:

PHP:

    public function onCommand(CommandSender $sender, Command $command, string $label, array $args) : bool{
       
        $cfg = new Config($this->getDataFolder() . "config.yml", Config::YAML);
        $server = $cfg->get("Server");
        $ranks = $cfg->get("Ranks");
        $name = $sender->getName();
        switch ($command->getName()){
            case "info":
            if(!empty($args[0])){
                if($args[0] == "ranks"){
                    $sender->sendMessage($this->prefix . $ranks);
                    return true;
                }
                if($args[0] == "server"){
                    $sender->sendMessage($this->prefix . $server);
                    return true;
            } else {
                $sender->sendMessage($this->prefix. "Β§aUsage: /info ranks|server"); //my try to show a message when a player runs the command /info
                return true;
            }
        }
    }
}

 

what is the error please ?

 

Well, its almost solved. Here is my new working code:

PHP:

526    public function onCommand(CommandSender $sender, Command $command, string $label, array $args) : bool{
527      
528        $cfg = new Config($this->getDataFolder() . "config.yml", Config::YAML);
529        $server = $cfg->get("Server");
530        $ranks = $cfg->get("Ranks");
531        $name = $sender->getName();
532        switch ($command->getName()){
533            case "info":
534            $sender->sendMessage($this->prefix. "Β§aUsage: /info ranks|server");
535            if(!empty($args[0])){
536                if($args[0] == "ranks"){
537                    $sender->sendMessage($this->prefix . $ranks);
538                    return true;
539                }
540                if($args[0] == "server"){
541                    $sender->sendMessage($this->prefix . $server);
542                    return true;
543            }
544        }
545    }
546  }

But I still get a console error:

Code:

2018-02-17 [09:58:29] [Server thread/INFO]: An unknown error occurred while attempting to perform this command
2018-02-17 [09:58:29] [Server thread/CRITICAL]: Unhandled exception executing command 'info' in info: Return value of MalakasPlayzMC\Core::onCommand() must be of the type boolean, none returned
2018-02-17 [09:58:29] [Server thread/CRITICAL]: TypeError: "Return value of MalakasPlayzMC\Core::onCommand() must be of the type boolean, none returned" (EXCEPTION) in "Core_v1.phar/src/MalakasPlayzMC/Core" at line 546
2018-02-17 [09:58:29] [Server thread/DEBUG]: #0 src/pocketmine/command/PluginCommand(58): MalakasPlayzMC\Core->onCommand(pocketmine\command\ConsoleCommandSender object, pocketmine\command\PluginCommand object, string info, array Array())
2018-02-17 [09:58:29] [Server thread/DEBUG]: #1 src/pocketmine/command/SimpleCommandMap(258): pocketmine\command\PluginCommand->execute(pocketmine\command\ConsoleCommandSender object, string info, array Array())
2018-02-17 [09:58:29] [Server thread/DEBUG]: #2 src/pocketmine/Server(1989): pocketmine\command\SimpleCommandMap->dispatch(pocketmine\command\ConsoleCommandSender object, string info)
2018-02-17 [09:58:29] [Server thread/DEBUG]: #3 src/pocketmine/Server(1974): pocketmine\Server->dispatchCommand(pocketmine\command\ConsoleCommandSender object, string info)
2018-02-17 [09:58:29] [Server thread/DEBUG]: #4 src/pocketmine/Server(2531): pocketmine\Server->checkConsole() 2018-02-17 [09:58:29] [Server thread/DEBUG]: #5 src/pocketmine/Server(2285): pocketmine\Server->tick()
2018-02-17 [09:58:29] [Server thread/DEBUG]: #6 src/pocketmine/Server(2158): pocketmine\Server->tickProcessor()
2018-02-17 [09:58:29] [Server thread/DEBUG]: #7 src/pocketmine/Server(1744): pocketmine\Server->start()
2018-02-17 [09:58:29] [Server thread/DEBUG]: #8 src/pocketmine/PocketMine(385): pocketmine\Server->__construct(BaseClassLoader object, pocketmine\utils\MainLogger object, string /home/gs/gs/data/servers/7069490/, string /home/gs/gs/data/servers/7069490/plugins/)
2018-02-17 [09:58:29] [Server thread/DEBUG]: #9 /home/gs/gs/data/servers/7069490/PocketMine-MP.phar(1): require(string phar:///home/gs/gs/data/servers/7069490/PocketMine-MP.phar/src/pocketmine/PocketMine.php)

 

Plus, when I run the command /info ranks or /info server I also get the usage message

 

set a return true; at the end of this command

 

PHP:

   public function onCommand(CommandSender $sender, Command $command, string $label, array $args) : bool{
       
        $cfg = new Config($this->getDataFolder() . "config.yml", Config::YAML);
        $server = $cfg->get("Server");
        $ranks = $cfg->get("Ranks");
        $name = $sender->getName();
        switch ($command->getName()){
            case "info":
            if(!empty($args[0])){
                if($args[0] == "ranks"){
                    $sender->sendMessage($this->prefix . $ranks);
                    return true;
                }
                if($args[0] == "server"){
                    $sender->sendMessage($this->prefix . $server);
                    return true;
            } else {
                $sender->sendMessage($this->prefix. "Β§aUsage: /info ranks|server"); //my try to show a message when a player runs the command /info
                return true;
            }
        }
   return true;
    }

 

Thanks! Hope it works.

 

you're welcome.

 

Just try for 2 Arguments

PHP:

if(empty($args[0]) || empty($args[1])){
#Send the usage
}else{
#code for the arguments

Should work well