Warning: require(vendor/autoload.php): Failed to open stream: No such file or directory in /home/gnc2/public_html/plugin/PHPMailer/get_oauth_token.php on line 18

Fatal error: Uncaught Error: Failed opening required 'vendor/autoload.php' (include_path='.:') in /home/gnc2/public_html/plugin/PHPMailer/get_oauth_token.php:18 Stack trace: #0 {main} thrown in /home/gnc2/public_html/plugin/PHPMailer/get_oauth_token.php on line 18