Development Assistance Sign EventListener Errors

@Shortninja66 Well, for me this still works (using same deprecated method).
Code is from a PogoStick29Dev's tutorial.




Tested with Essentials's Economy system and Vault 1.5.2 plugin/API:

Code:

package me.something.else;

import net.milkbowl.vault.economy.Economy;
import net.milkbowl.vault.economy.EconomyResponse;

import org.bukkit.Material;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.entity.Player;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.PlayerInventory;
import org.bukkit.plugin.RegisteredServiceProvider;
import org.bukkit.plugin.java.JavaPlugin;

public class Main extends JavaPlugin {

    public static Economy econ = null;

       @Override
        public void onEnable() {
            if (!setupEconomy() ) {
                getLogger().severe(String.format("[%s] - Disabled due to no Vault dependency found!", getDescription().getName()));
                getServer().getPluginManager().disablePlugin(this);
                return;
            }
        }

        private boolean setupEconomy() {
            if (getServer().getPluginManager().getPlugin("Vault") == null) {
                return false;
            }
            RegisteredServiceProvider<Economy> rsp = getServer().getServicesManager().getRegistration(Economy.class);
            if (rsp == null) {
                return false;
            }
            econ = rsp.getProvider();
            return econ != null;
        }


    public boolean onCommand(CommandSender sender, Command cmd, String commandLabel, String[] args) {
        if (!(sender instanceof Player)) {
            sender.sendMessage("§cOnly players can get kits!");
            return true;
        }
    
        Player p = (Player) sender;
        PlayerInventory pi = p.getInventory();
    
        if (cmd.getName().equalsIgnoreCase("kit")) {
            EconomyResponse r = econ.withdrawPlayer(p.getName(), 10);
            if (r.transactionSuccess()) {
                pi.addItem(new ItemStack(Material.STONE_SWORD, 1));
                pi.addItem(new ItemStack(Material.STONE_PICKAXE, 1));
                pi.addItem(new ItemStack(Material.APPLE, 5));
                p.sendMessage("§aYou got your kit!");
                return true;
            }
            else {
                p.sendMessage("§cYou cannot get a kit at this time.");
                return true;
            }
        }
    
        if (cmd.getName().equalsIgnoreCase("ci")) {
            pi.clear();
            p.sendMessage("§aInventory cleared!");
        }
    
        return true;
    
    }
}