Sending email

[PHPMailer]

Kindly asking for any advise on how I can get the php mailer working on this code.
ive been working on this for about 3 weeks now and just cant get it to run.
I don’t have anyone to ask. I didn’t go to any school just trying to learn how to code by my self using tutorials and web infos.

[PHPMailer]

I tried changing ports ,
I uploaded the latest version of phpmailer, uploaded the whole folder to htdocs ,
I created a php file with the coide below, placed it inside htdocs
there is no error on the browser , but on the browser logs it shows

HTTP500: SERVER ERROR - The server encountered an unexpected condition that prevented it from fulfilling the request.
POST - http://www.justtestingaform.rf.gd/part1.php

0: Unable to get property ‘SavePersonalAndPaymentData’ of undefined or null reference

[PHPMailer]

Im using the code below:

?php
$error = '';
$name = '';
$email = '';
$subject = '';
$message = '';

function clean_text($string)
{
 $string = trim($string);
 $string = stripslashes($string);
 $string = htmlspecialchars($string);
 return $string;
}

if(isset($_POST["submit"]))
{
 if(empty($_POST["name"]))
 {
  $error .= '<p><label class="text-danger">Please Enter your Name</label></p>';
 }
 else
 {
  $name = clean_text($_POST["name"]);
  if(!preg_match("/^[a-zA-Z ]*$/",$name))
  {
   $error .= '<p><label class="text-danger">Only letters and white space allowed</label></p>';
  }
 }
 if(empty($_POST["email"]))
 {
  $error .= '<p><label class="text-danger">Please Enter your Email</label></p>';
 }
 else
 {
  $email = clean_text($_POST["email"]);
  if(!filter_var($email, FILTER_VALIDATE_EMAIL))
  {
   $error .= '<p><label class="text-danger">Invalid email format</label></p>';
  }
 }
 if(empty($_POST["subject"]))
 {
  $error .= '<p><label class="text-danger">Subject is required</label></p>';
 }
 else
 {
  $subject = clean_text($_POST["subject"]);
 }
 if(empty($_POST["message"]))
 {
  $error .= '<p><label class="text-danger">Message is required</label></p>';
 }
 else
 {
  $message = clean_text($_POST["message"]);
 }
 if($error == '')
 {
  require 'PHPmailer/src/PHPMailer.php';
   require 'PHPmailer/src/SMTP.php';
   require './PHPMailer/src/Exception.php'; 
  $mail = new PHPMailer;
  $mail->Host = 'smtp.gmail.com';  //Sets the SMTP hosts
  $mail->SMTPSecure = 'ssl';       //Sets connection prefix. Options are "", "ssl" or "tls"
  $mail->Port = '465';        //Sets the default SMTP server port
  $mail->SMTPAuth = true;       //Sets SMTP authentication. Utilizes the Username and Password variables
  $mail->Username = '[email protected]';     //Sets SMTP username
  $mail->Password = 'password';     //Sets SMTP password
  $mail->From = $_POST["email"];     //Sets the From email address for the message
  $mail->FromName = $_POST["name"];    //Sets the From name of the message
  $mail->AddAddress('[email protected]', 'Name');//Adds a "To" address
  $mail->AddCC($_POST["email"], $_POST["name"]); //Adds a "Cc" address
  $mail->WordWrap = 50;       //Sets word wrapping on the body of the message to a given number of characters
  $mail->IsHTML(true);       //Sets message type to HTML    
  $mail->Subject = $_POST["subject"];    //Sets the Subject of the message
  $mail->Body = $_POST["message"];    //An HTML or plain text message body
  if($mail->Send())        //Send an Email. Return true on success or false on error
  {
   $error = '<label class="text-success">Thank you for contacting us</label>';
  }
  else
  {
   $error = '<label class="text-danger">There is an Error</label>';
  }
  $name = '';
  $email = '';
  $subject = '';
  $message = '';
 }
}

?>

[Ergastolator1]

On the contact form HTML file put required attributes on all the fields, and on the email field put as type email. On the autoloader.php file put this code:

<?php require "/path/to/Exception.php"; require "/path/to/PHPMailer.php"; require "/path/to/SMTP.php"; ?>

overwriting /path/to/ with the location of the PHPMailer class required files. Then use as preprocessing code this:

<?php
	date_default_timezone_set("Etc/UTC");
	use PHPMailer\PHPMailer\PHPMailer;
	use PHPMailer\PHPMailer\Exception;

	require "/path/to/autoloader.php";

	$mail = new PHPMailer(true);
	//$mail->setLanguage("lang", "/path/to/PHPMailer/language/");

	$name = $_POST["name"];
	$email = $_POST["email"];
    $subject = $_POST["subject"];
	$message = $_POST["message"];
	try {
		$mail->isSMTP();
		$mail->Host = "ssl://smtp.gmail.com:465"; // Hostname - it could include even protocols and ports if it wouldn't work the first time
		$mail->SMTPAuth = true;
		$mail->Username = "yourgmail"; // overwrite "yourgmail" with the Gmail you're going to use
		$mail->Password = "********"; // overwrite the asterisks with your Gmail password

		$mail->setFrom($email, $name);
		$mail->addAddress("yourGmail"); // overwrite "yourGmail" with your own Gmail address
		$mail->addCC($email, $name);
		$mail->isHTML(true);
		$mail->Subject = $subject;
		$mail->Body = $message;
		$mail->AltBody = $message;
		$mail->send();
		echo("Thank you for contacting us!");
		die();
	} catch (Exception $e) {
	    echo("There is an error on the mailer. Error: ".$e->getMessage());
        die();
	}
?>

replacing /path/to/ with the location of the autoloader.php file and following the instructions on the comments.

[PHPMailer]

Im so happy your reply was very fast.
which one is the autoloader. php?
is this the file Oauth. php inside the Phpmailer folder I downloaded from the site.

Thank you this will help a lot

[Ergastolator1]

You need to create the autoloader.php file if it doesn’t exist on the same folder where you put the mailer processor file with the contents I specified on the quote below:

@Ergastolator1

<?php require "/path/to/Exception.php"; require "/path/to/PHPMailer.php"; require "/path/to/SMTP.php"; ?>

overwriting /path/to/ with the location of the PHPMailer class required files. The OAuth.php is only needed if you want to connect to SMTP using the Gmail’s OAuth Keys.