* Este es mi código y tuve este error cuando intento conectar nodejs con react use nodemailer, ¿me pueden ayudar a resolverlo, por favor? * index.js:1 Error: Error de red en createError (createError.js:16) en XMLHttpRequest.handleError (xhr.js:117)

 const express = require("express"); const app = express(); require("dotenv").config(); const bodyParser = require("body-parser"); const cors = require("cors"); const nodemailer = require("nodemailer"); app.use(bodyParser.urlencoded({ extended: true })); app.use(bodyParser.json()); app.use(cors()); app.post("/send_mail", cors(), async (req, res) => { let { text } = req.body; const transport = nodemailer.createTransport({ host: process.env.MAIL_HOST, port: process.env.MAIL_PORT, auth: { user: process.env.MAIL_USER, pass: process.env.MAIL_PASS, }, }); await transport.sendMail({ from: process.env.MAIL_FROM, to: "test@test.com", subject: "test email", html: `<div className="email" style=" border: 1px solid black; padding: 20px; font-family: sans-serif; line-height: 2; font-size: 20px; "> <h2>Here is your email!</h2> <p>${text}</p> <p>All the best, Ala</p> </div> `, }); }); app.listen( (process.env.PORT || 4000, () => { console.log("Server is listening on port 4000"); }) );