Warning: require(vendor/autoload.php): Failed to open stream: No such file or directory in /var/www/html/GameAPI/Mailer/mailjet-apiv3-php-no-composer/test/Mailjet/test.php on line 6

Fatal error: Uncaught Error: Failed opening required 'vendor/autoload.php' (include_path='.:/usr/local/lib/php') in /var/www/html/GameAPI/Mailer/mailjet-apiv3-php-no-composer/test/Mailjet/test.php:6 Stack trace: #0 {main} thrown in /var/www/html/GameAPI/Mailer/mailjet-apiv3-php-no-composer/test/Mailjet/test.php on line 6