nicks plugin HELP!

package me.Nick_Titan;

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

public class Test extends JavaPlugin {

	@Override
	public void onEnable() {
		getLogger().info("TestPlugin is enabled! you can now use your custom plugin!");
	}

	@Override
	public void onDisable() {

	}

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

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

			Player player = (Player) sender;

			player.sendMessage("§6Test Plugin Was Successful!");

			return true;

		}

		return false;
	}

}