qr code not working

I try to node api.js and run in terminal,then I access ip:5000/auth/getqr ,Qr in that url doesn't work,and every time I refresh,the token in components/last.qr doesn't change

this is the code in api.js
`const express = require("express");
const bodyParser = require("body-parser");
const fs = require("fs");
const axios = require("axios");
const shelljs = require("shelljs");

const config = require("./config.json");
const { Client, LocalAuth } = require("whatsapp-web.js");

process.title = "whatsapp-node-api";
global.client = new Client({
authStrategy: new LocalAuth(),
puppeteer: {
headless: true,
args: ['--no-sandbox']
},
});

global.authed = false;

const app = express();

const port = process.env.PORT || config.port;
//Set Request Size Limit 50 MB
app.use(bodyParser.json({ limit: "50mb" }));

app.use(express.json());
app.use(bodyParser.urlencoded({ extended: true }));

client.on("qr", (qr) => {
console.log("qr");
fs.writeFileSync("./components/last.qr", qr);
});

client.on("authenticated", () => {
console.log("AUTH!");
authed = true;

try {
fs.unlinkSync("./components/last.qr");
} catch (err) {}
});

client.on("auth_failure", () => {
console.log("AUTH Failed !");
process.exit();
});

client.on("ready", () => {
console.log("Client is ready!");
});

client.on("message", async (msg) => {
if (config.webhook.enabled) {
if (msg.hasMedia) {
const attachmentData = await msg.downloadMedia();
msg.attachmentData = attachmentData;
}
axios.post(config.webhook.path, { msg });
}
});
client.on("disconnected", () => {
console.log("disconnected");
});
client.initialize();

const chatRoute = require("./components/chatting");
const groupRoute = require("./components/group");
const authRoute = require("./components/auth");
const contactRoute = require("./components/contact");

app.use(function (req, res, next) {
console.log(req.method + " : " + req.path);
next();
});
app.use("/chat", chatRoute);
app.use("/group", groupRoute);
app.use("/auth", authRoute);
app.use("/contact", contactRoute);

app.listen(port, () => {
console.log("Server Running Live on Port : " + port);
});`

[jhernancanom]

Me too.
This is the QR image generated, but the phone does not read it: no err, just not read.
I zoom it a little bigger (I also zoom it shorter), but nothing happens: the WtahsApp QR reader does not read it.