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Fatal error: Uncaught Error: Failed opening required '/var/www/html/includes/../vendor/autoload.php' (include_path='.:/usr/local/lib/php') in /var/www/html/includes/MailerClass.php:18 Stack trace: #0 /var/www/html/includes/short-courses-mail.php(8): require_once() #1 /var/www/html/applicant-register.php(3): require_once('/var/www/html/i...') #2 {main} thrown in /var/www/html/includes/MailerClass.php on line 18