[Help!] Coding Error :\

Code:

plugin YML :

name: Hub
main: me.Hub
version: 1.0
commands:
    Hub:
        description: Teleports sender to Hub!
        usage: /<command>

Java code :

Code:

package me.Hub;

import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.plugin.java.JavaPlugin;

public class Hub extends JavaPlugin {

    @Override
    public void onEnable() {
        getLogger().info("Hub plugin is being enabled!");
    }

    @Override
    public void onDisable() {

    }

    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {

        if (cmd.getName().equalsIgnoreCase("Hub") && sender instanceof Player) {

            Player player = (Player) sender;

            player.sendMessage("Plugin is still in dev!");

            return true;

        }

        return false;

    }

}

Thanks in advance if anyone could help to aid this problem regarding the error i am facing.