Fatal error: Uncaught RuntimeException: Did not find vendor/autoload.php. Did you run "composer install --dev"? in /var/www/html/phpkobo/research/php-downloaded-apps/phpmailer-5-2-16/PHPMailer-5.2.16/vendor/jms/serializer/tests/bootstrap.php:23 Stack trace: #0 /var/www/html/phpkobo/research/php-downloaded-apps/phpmailer-5-2-16/PHPMailer-5.2.16/vendor/jms/serializer/tests/bootstrap.php(30): {closure}() #1 {main} thrown in /var/www/html/phpkobo/research/php-downloaded-apps/phpmailer-5-2-16/PHPMailer-5.2.16/vendor/jms/serializer/tests/bootstrap.php on line 23