How to fix error in console (node ​​js)?

Question

JavaScript

I use "Botact" library and "node js" framework to create a bot.
There is the following code

const express = require('express');

const bodyParser = require('body-parser');

const {Botact} = require('botact');

const server = express();

const bot = new Botact({
  token: 'my_token',
  confirmation: ' my_token'
})

bot.on(function (ctx) {
  ctx.reply(ctx.body);
})

server.use(bodyParser.json());

server.post('/',bot.listen); 

server.listen(80);

When the function is executed, namely the line "ctx.reply(ctx.body);", the error "UnhandledPromiseRejectionWarning: #Object" is output to the console. Previously, I did not meet such an error and I did not find a clear answer to the question in the vastness of the Russian Internet, please help.