Error while saving Database while usiing Mongoose in NodeJS

(PLEASE HELP ME TO SOLVE THIS ERROR OF MONGOOSE)

Node.js v18.8.0
PS C:Users97798DesktopCWH_WEB_DEVLOPMENTExpressDANCE__WEBSITE> node app.js
body-parser deprecated undefined extended: provide extended option app.js:40:17
The application started successfully on port 8000
node:internal/errors:484
ErrorCaptureStackTrace(err);
^

Error [ERR_HTTP_HEADERS_SENT]: Cannot set headers after they are sent to the client
at new NodeError (node:internal/errors:393:5)
at ServerResponse.setHeader (node:_http_outgoing:607:11)
at ServerResponse.header (C:Users97798DesktopCWH_WEB_DEVLOPMENTExpressDANCE__WEBSITEnode_modulesexpresslibresponse.js:794:10)
at ServerResponse.send (C:Users97798DesktopCWH_WEB_DEVLOPMENTExpressDANCE__WEBSITEnode_modulesexpresslibresponse.js:174:12)
at C:Users97798DesktopCWH_WEB_DEVLOPMENTExpressDANCE__WEBSITEapp.js:81:17
at process.processTicksAndRejections (node:internal/process/task_queues:95:5) {
code: ‘ERR_HTTP_HEADERS_SENT’
}

And This is my Backend Code Using Mongoose,Express,pug and node.js.

I HAVE A ABOVE ERROR IN THIS BELOW APP.JS CODE.{PLEASE HELP ME GUYS.}

const express = require(“express”);
const path = require(“path”);
const mongoose = require(‘mongoose’);

const bodyparser = require(“body-parser”);
main().catch(err => console.log(err));

async function main() {
mongoose.connect(‘mongodb://localhost:27017/contactDance’);

}
const app = express();
const port = 8000;

 

// Define mongoose schema
const contactSchema = new mongoose.Schema({
name: String,
phone:String,
email:String,
address:String,
desc:String
});

const Contact = mongoose.model(‘Contact’, contactSchema);

app.use(‘/static’, express.static(‘static’))
app.use(express.urlencoded())

 

app.set(‘view engine’, ‘pug’) // Set the template engine as pug
app.set(‘views’, path.join(__dirname, ‘views’)) // Set the views directory

 

app.get(‘/’, (req, res)=>{

const params = { }
res.status(200).render(‘home.pug’, params);

})

 

app.get(‘/contact’, (req, res)=>{

const params = { }
res.status(200).render(‘contact.pug’, params);
})

 

app.post(‘/contact’, (req, res)=>{

var myData =new Contact(req.body);

myData.save().then(()=>{
res.send(“This item has been saved in the database.”)

})
.catch(()=>{
res.status(400).send(“Item was not saved to the database.”)
})

res.status(200).render(‘contact.pug’);
})

 

// START THE SERVER
app.listen(port, ()=>{
console.log(`The application started successfully on port ${port}`);
});

const express = require(“express”);
const path = require(“path”);
const mongoose = require(‘mongoose’);

const bodyparser = require(“body-parser”);
main().catch(err => console.log(err));

async function main() {
mongoose.connect(‘mongodb://localhost:27017/contactDance’);

}
const app = express();
const port = 8000;

 

// Define mongoose schema
const contactSchema = new mongoose.Schema({
name: String,
phone:String,
email:String,
address:String,
desc:String
});

const Contact = mongoose.model(‘Contact’, contactSchema);

app.use(‘/static’, express.static(‘static’))
app.use(express.urlencoded())

 

app.set(‘view engine’, ‘pug’) // Set the template engine as pug
app.set(‘views’, path.join(__dirname, ‘views’)) // Set the views directory

 

app.get(‘/’, (req, res)=>{

const params = { }
res.status(200).render(‘home.pug’, params);

})

 

app.get(‘/contact’, (req, res)=>{

const params = { }
res.status(200).render(‘contact.pug’, params);
})

 

app.post(‘/contact’, (req, res)=>{

var myData =new Contact(req.body);

myData.save().then(()=>{
res.send(“This item has been saved in the database.”)

})
.catch(()=>{
res.status(400).send(“Item was not saved to the database.”)
})

res.status(200).render(‘contact.pug’);
})

 

// START THE SERVER
app.listen(port, ()=>{
console.log(`The application started successfully on port ${port}`);
});