Try something like
if (!class_exists('PHPMailer\PHPMailer\Exception'))
{
require '/home3/afaflawm/vendor/phpmailer/phpmailer/src/Exception.php';
require '/home3/afaflawm/vendor/phpmailer/phpmailer/src/PHPMailer.php';
require '/home3/afaflawm/vendor/phpmailer/phpmailer/src/SMTP.php';
}
I kept the first two lines commented while the third one for SMTP uncommented and it started working
//require '/home3/afaflawm/vendor/phpmailer/phpmailer/src/Exception.php';
//require '/home3/afaflawm/vendor/phpmailer/phpmailer/src/PHPMailer.php';
require '/home3/afaflawm/vendor/phpmailer/phpmailer/src/SMTP.php';
So the problem was caused by the first two require statements as they were already loaded by the composer on this line require 'vendor/autoload.php'
except the SMTP. Therefore the error was displaying in both cases when I tried commenting all three lines once and composer the other time separately
Based on @Far findings, the answer is:
require_once ABSPATH . 'wp-
includes/PHPMailer/Exception.php';
require_once ABSPATH . 'wp-includes/PHPMailer/PHPMailer.php';
require_once ABSPATH . 'wp-includes/PHPMailer/SMTP.php';
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