Node.js + Express - node.js

Question

I was creating a contact form using nodemailer. I implemented it and it was working fine, but some time later I came back to do a final test in postman it started to give me the following error"message": Not Found - /contact and "stack": "Error: Not Found - /contact\n . I am not sure what's causing the error.
this is code:
const transport = {
host: 'smtp.gmail.com', // Don’t forget to replace with the SMTP host of your provider
port: 587,
secure: false, // use SSL
auth: {
user: process.env.GMAIL,
pass: process.env.PASSWORD
}
}
const transporter = nodemailer.createTransport(transport)
transporter.verify((error, success) => {
if (error) {
console.log(error);
} else {
console.log('Server is ready to take messages');
}
});
app.post('/contact', (req, res, next) => {
const name = req.body.name
const email = req.body.email
const message = req.body.message
const content = ` name: ${name} \n email: ${email} \n message: ${message} `
const mail = {
from: name,
// to: 'RECEIVING_EMAIL_ADDRESS_GOES_HERE', // Change to email address that you want to receive messages on
to: 'xxx#gmail.com', // Change to email address that you want to receive messages on
subject: 'New Message from Contact Form',
text: content
}
transporter.sendMail(mail, (err, data) => {
if (err) {
res.json({
status: 'fail'
})
} else {
res.json({
status: 'success'
})
}
})
})