Solved Problem with my plugin

Hey, i'm new in bukkit developing. I'm trying to create a faction plugin. I create the command /f create but I have a problem: it doesn't work. Now i'll explain why.
First of all, when I tryed to make the server start, the plugin wasn't loaded. Then i tryed to delete the "commands" part in the yml file the plugin was loaded, but the commands I created didn't work. So... any advice? Here are the codes that could be useful:

File yml:

Code:

name: NewFactions
author: Koyote_059
version: 1.0
description: plugin
main: it.ss.factionplugin.koyote.NewFactions
commands:
    f: 
        description: Fazioni
        usage: f 

Main Class:

Code:

package it.ss.factionplugin.koyote;

import org.bukkit.plugin.java.JavaPlugin;

public class NewFactions extends JavaPlugin {
    @Override
    public void onEnable(){
        loadConfig();
        registerCommands();
    }
   
    @Override
    public void onDisable() {
       
    }
   
   
    private void loadConfig() {
        getConfig().options().copyDefaults(true);
        saveConfig();
    }
   
    private void registerCommands() {
        getCommand("f").setExecutor(new cmds());
    }
   
}

Command class:

Code:

package it.ss.factionplugin.koyote;

import java.awt.Color;

import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;

 public class cmds implements CommandExecutor{
    private NewFactions plugin = new NewFactions();
   
    @Override
    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
       
           
            if(label.equalsIgnoreCase("f") && sender instanceof Player) {
                Player player = (Player) sender;
                if(args[0].equalsIgnoreCase("create")) {
                    if(args.length == 2) {
                        if(args[1].length()>3 && args[1].length() <11) {
                            plugin.getConfig().set("NameFaction_" + args[1] + ".Player_"+ player.getUniqueId() , "Factions:");
                            player.sendMessage(Color.GREEN + "Fazione "  + args[1] + " creata!");
                        } else {
                            sender.sendMessage(ChatColor.RED + "Il nome della fazione deve contenere dai 3 ai 10 caratteri");
                        }       
                    } else {
                        sender.sendMessage("Sintassi corretta: " + Color.GREEN + "/f create [nome]");
                    }
                }
                return true;
            }
        return false;
    }
}

 

The commands for the plugins will not work if the plugin did not load when you started the server. Is there a console error when you start up the server? Also, make sure the plugin.yml has the correct main class.

 

It Says that the yml file is invalid, I don't know why... It says something about the description in the first lines of error

I solved the Yml problem, but the command doesn't start working

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

@Koyote_059 I don't know if this could be the problem but you are checking if arg 0 is "create" before checking if it is set.

 

Solved, thank you all.

 

@Koyote_059 Good to know, now please change the title prefix to solved.