Call small api from a class

Hi everybody,
here I have a little problem in java ^^ (I'm french, sorry for my mistakes)
I found a file that can easily create yml on GitHub except that I have some problems other than to call from onEnable.

Code GitHub :

Spoiler

Code (Text):

package fr.maniac058.ReportPlus.configuration;

import com.google.common.io.ByteStreams;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.logging.Level;
import net.md_5.bungee.api.plugin.Plugin;
import net.md_5.bungee.config.Configuration;
import net.md_5.bungee.config.ConfigurationProvider;
import net.md_5.bungee.config.YamlConfiguration;
/**
* BungeeCord configuration utility class.
*
* @author rylinaux
*/
public class BungeeConfig {
    /**
     * Configuration provider we want for this config
     */
    private static final ConfigurationProvider provider = ConfigurationProvider.getProvider(YamlConfiguration.class);
    /**
     * The plugin instance
     */
    private final Plugin plugin;
    /**
     * The file we're working with
     */
    private final File file;
    /**
     * The config
     */
    private Configuration config;
    /**
     * Construct our object (using the default config name).
     *
     * @param plugin the plugin instance
     */
    public BungeeConfig(Plugin plugin) {
        this(plugin, "config.yml");
    }
    /**
     * Construct our object (using a custom config name).
     *
     * @param plugin the plugin instance
     * @param name   the name of the config file
     */
    public BungeeConfig(Plugin plugin, String name) {
        this(plugin, new File(plugin.getDataFolder(), name));
    }
    /**
     * Construct our object (using a custom file, use for sub-folders).
     *
     * @param plugin the plugin instance
     * @param file   the config file
     */
    public BungeeConfig(Plugin plugin, File file) {
        this.plugin = plugin;
        this.file = file;
        load();
    }
    /**
     * Load our config, copying defaults if the file doesn't exist.
     */
    public void load() {
        if (!file.getParentFile().exists()) {
            file.getParentFile().mkdirs();
        }
        if (!file.exists()) {
            try {
                file.createNewFile();
            } catch (IOException e) {
                plugin.getLogger().log(Level.SEVERE, String.format("Could not create config file '%s'.", file.getName()), e);
            }
            try (InputStream in = plugin.getResourceAsStream(file.getName()); OutputStream out = new FileOutputStream(file)) {
                ByteStreams.copy(in, out);
            } catch (FileNotFoundException e) {
                plugin.getLogger().log(Level.SEVERE, String.format("Config file '%s' not found.", file.getName()), e);
            } catch (IOException e) {
                plugin.getLogger().log(Level.SEVERE, String.format("Could not copy defaults to file '%s'.", file.getName()), e);
            }
        }
        try {
            config = provider.load(file);
        } catch (IOException e) {
            plugin.getLogger().log(Level.SEVERE, String.format("Could not load config '%s'.", file.getName()), e);
        }
    }
    /**
     * Saves the configuration.
     */
    public void save() {
        try {
            provider.save(config, file);
        } catch (IOException e) {
            plugin.getLogger().log(Level.SEVERE, String.format("Could not save config '%s'.", file.getName()), e);
        }
    }
    /**
     * Returns the backing YAML configuration implementation.
     *
     * @return the backing YAML configuration
     */
    public Configuration getConfig() {
        return config;
    }
    /**
     * Returns the file associated with the config.
     *
     * @return the config's file
     */
    public File getFile() {
        return file;
    }
}

Call file :

Spoiler

Code (Text):

package fr.maniac058.ReportPlus.configuration;

import net.md_5.bungee.api.plugin.Plugin;

public class Configuration extends Plugin{
   
   BungeeConfig config = null;
   
   public void setupConfig()
   {
     try
     {
       this.config = new BungeeConfig(this);
       this.config.load();
     }
     catch (Exception ex)
     {
      ex.printStackTrace();
     }
   }
   
   /*public boolean getUseDatabase(){
     try
     {
       this.config = new BungeeConfig(this);
       this.config.load();
       return this.config.getConfig().getBoolean("UseDatabase");
       //String port = this.config.getConfig().getString("port");
       //System.out.println(ChatColor.RED+""+port);
       //this.config.save();
     }
     catch (Exception ex)
     {
      ex.printStackTrace();
     }
     return false;
      //return this.UseDatabase;
   }*/
}
 

And first file :

Spoiler

Code (Text):

package fr.maniac058.ReportPlus;

import fr.maniac058.ReportPlus.configuration.*;
import fr.maniac058.ReportPlus.utils.ChatUtilities;

public class Main{

   Configuration configuration = null;
   
   public void onEnable(){
     configuration.setupConfig();
     ChatUtilities.ConsoleMenssage("Has been enabled!");
   }
   
   public void onDisable()
   {
    ChatUtilities.ConsoleMenssage("Has been disabled!");
   }
   
   
     
   /*public void setupConfig()
   {
     try
     {
       this.config = new BungeeConfig(this);
       this.config.load();
       //ChatUtilities.ConsoleMenssage("UseData"+configuration.getUseDatabase());
       //String port = this.config.getConfig().getString("port");
       //System.out.println(ChatColor.RED+""+port);
       //this.config.save();
     }
     catch (Exception ex)
     {
      ex.printStackTrace();
     }
   }*/
}
 

Thak you for your help

I almost forgot
Screen console: http://prntscr.com/740lw5