Bot can't take item from chest

[nikitapro225]

const mineflayer = require('mineflayer');
const { pathfinder, Movements, goals } = require('mineflayer-pathfinder');
const GoalBlock = goals.GoalBlock;
var vec3 = require('vec3');
const webgui = require('mineflayer-web-inventory');
const Inventory = mineflayer.Inventory;
bot = mineflayer.createBot({
    host: 'localhost',
    port: 25565,
    username: 'Bot',
    version: '1.12.2'
})
webgui(bot)
bot.loadPlugin(pathfinder);
bot.on('login', () => {
    console.log('\x1b[42m\x1b[30m[+] Logged in');
})
let java = '';
let isBusy = false;
bot.on('whisper', (username, message, rawMessage) => {
    const args = message.split(' ');
    if (args[0] === 'kit') {
        if (args.length === 4) {
            const x = parseInt(args[1]);
            const y = parseInt(args[2]);
            const z = parseInt(args[3]);
            
            if (isNaN(x) || isNaN(y) || isNaN(z)) {
                bot.whisper(username, 'Invalid coordinates. Please enter valid numbers for x, y, and z.');
            } else {
                if (bot.pathfinder.isMoving()){
                    bot.whisper(username, 'I\'m busy right now. Please try again later.');
                } else {
                    java = username;
                    console.log(`\x1b[42m\x1b[30m[+] Delivery! ${x}, ${y}, ${z}`);
                    //bot.whisper(username, `Kit coordinates: `);
                    isBusy = true;
                    const targetBlock = new vec3(-131, 71, -194);
                    const block = bot.blockAt(targetBlock);
                    if (block && block.type === 54) { // 54 is the block ID for a chest
                        bot.openChest(block);
                    } else {
                        console.error(`Cannot find a chest at ${targetBlock.x}, ${targetBlock.y}, ${targetBlock.z}`);
                        bot.whisper(username, 'Cannot find a chest at the specified coordinates.');
                    }
                    bot.once('chest_open', (chest) => {
                        const shulkerBoxSlot = chest.findInventoryItem('purple_shulker_box');
                        if (shulkerBoxSlot) {
                            const shulkerBox = chest.takeItem(shulkerBoxSlot.index);
                            console.log(shulkerBox);
                            bot.equip(shulkerBox, 'hand', () => {
                                const goal = new GoalBlock(x, y, z);
                                bot.pathfinder.setGoal(goal);
                                bot.once('goal_reached', () => {
                                    bot.placeBlock(x, y+1, z, 'shulker_box');
                                    isBusy = false;
                                    bot.whisper(username, 'Done!');
                                });
                            });
                        }
                    });
                    bot.whisper(username, 'I\'m going to you');
                }
                 // set busy to false after 5 seconds
            }
        } else {
            bot.whisper(username, 'Invalid kit command. Usage: kit <x> <y> <z>');
        }
    }
})

[extremeheat]

Not enough information

[nikitapro225]

Not enough information

I fix my code