private FileConfiguration player;
  private File playerf;

  public void onEnable()
  {
      // Define the plugin
      plugin = this;

      // Create the file
      createFiles();
}
  public void onDisable()
  {

      saveDefaultConfig();

      // Prevent memmory from leeking
      plugin = null;
  }

// work like getConfig()
  public FileConfiguration getPlayerConfig() {
      return this.player;
  }

// createFiles();
  private void createFiles(){

      // Define player.yml
      playerf = new File(getDataFolder(), "player.yml");


      // Create player.yml
      if(!playerf.exists()) {
          playerf.getParentFile().mkdirs();
          saveResource("player.yml", false);
      }

      // Load player.yml
      player = new YamlConfiguration();
      try{
          player.load(playerf);
      } catch (IOException e){
          e.printStackTrace();
      } catch (InvalidConfigurationException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
  }

// getPlayerConfigFile()
  public File getPlayerConfigFile() {
      return this.playerf;
  }


// After set config
// Put this after the code that you load the config to set a value
main.plugin.saveDefaultConfig();
            try {
               main.plugin.getLuckyNumberConfig().save(main.plugin.getLuckyNumberConfigFile());
            } catch (IOException fpe) {
               //Whatever you want to print/etc for error purposes
            }
            }