Config generation

Hello, I've run into a small problem while rewriting PVPWorld for 1.4. My config file is generated but is blank. There or no errors on console and the code works fine. Even when saved the file stays blank.

PHP:

<?php

namespace pvpworld;

use pocketmine\Server;
use pocketmine\Player;
use pocketmine\command\Command;
use pocketmine\command\CommandSender;
use pocketmine\event\Listener;
use pocketmine\event\entity\EntityDamageByEntityEvent;
use pocketmine\plugin\PluginBase;
use pocketmine\utils\TextFormat;

class Main extends PluginBase implements Listener {
    private $config;

    public function onEnable() {     
        $this->config = $this->getConfig();
        if(!$this->config->exists("message")) {
            $this->config->set("message", "You're not allowed to hurt players here.");
            $this->config->save();
        }     
        if(!$this->config->exists("pvp-worlds")) {
            $this->config->set("pvp-worlds", []);
            $this->config->save();
        } 
        $this->getServer()->getPluginManager()->registerEvents($this, $this);
        $this->getServer()->setConfigBool("pvp", true);
    }

    public function onCommand(CommandSender $sender, Command $command, $label, array $args) {
        if(strtolower($command->getName()) == "pvpworld") {
            if($sender instanceof Player) {
                $world = $sender->getLevel()->getName();
            }else{
                $world = $this->getServer()->getDefaultLevel()->getName();
            }
            if(isset($args[1])) {
                if($this->getServer()->isLevelLoaded($args[1])) {
                    $world = $args[1];
                }else{
                    $sender->sendMessage("That world doesn't exist.\n");
                    return true;
                }
            }
            $mode = in_array($world, $this->config->get("pvp-worlds"));
            if(isset($args[0])) {
                $mode = $args[0] == "on";
            }
            if($mode) {
                $sender->sendMessage("PVP is now enabled in \"$world\"");
                if(($key = array_search($world, $this->config->get("pvp-worlds"))) !== false) {
                    $arr = $this->config->get("pvp-worlds");
                    unset($arr[$key]);
                    $this->config->set("pvp-worlds", $arr);
                }
            }else{
                $sender->sendMessage("PVP is now disabled in \"$world\"");
                $arr = $this->config->get("pvp-worlds");
                array_push($arr, $world);
                $this->config->set("pvp-worlds", $arr);
            }
            $this->config->save();
        }
        return true;
    }
 
    public function onEntityDamageByEntity(EntityDamageByEntityEvent $event){
        $victim = $event->getEntity();
        $attacker = $event->getDamager();
        if($victim instanceof Player && $attacker instanceof Player){
            if(in_array($attacker->getLevel->getName(), $this->config->get("pvp-worlds")) && !$attacker->hasPermission("pvpworld.bypass")) {
                $attacker->sendMessage($this->config->get("message"));
                $event->setCancelled();
            }
        }
    }
 
}

how about you generate a new config and not use the already madden one

Dont you need another 'use' for the config?

what ?

No. The code that uses the Config class is at PluginBase.php, not here. However, my suggestion is to instantiate a new config file rather than $this->getConfig() if you don't already have a config file present.

Thanks guys.