PHP mailer works on Local Machine but not on AWS LightSail server

Question

My Problem is that PHP mailer works on my local machine, but does not work when I deploy the script to my AWS Lightsail server.

I have tried setting the proper file (644) and folder(755) permissions, still nothing works.

I have the function deployed on other servers, without any issue

The error message

PHP Fatal error: Uncaught Error: Class 'PHPMailer\PHPMailer\PHPMailer' not found in

How I include the mail function require('transit/mail.php');

The content of my mail function.

use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\Exception;
require 'vendor/autoload.php';

function send_mail($sender, $senderName, $recipient, $subject, $bodyText, $bodyHtml){

Answer 1

I have solved the issue. These are the steps I followed.

1. Connect to the server via ssh terminal
2. Navigate to the php mailer folder
   3. Run composer require phpmailer/phpmailer

This was the message received.

Using version ^6.1 for phpmailer/phpmailer ./composer.json has been created Loading composer repositories with package information Updating dependencies (including require-dev) Nothing to install or update Writing lock file Generating autoload files

It worked afterwards.