Warning: require(vendor/autoload.php): failed to open stream: No such file or directory in /home/bas404/public_html/occ-e-filing/PHPMailer/get_oauth_token.php on line 59

Fatal error: require(): Failed opening required 'vendor/autoload.php' (include_path='.:/opt/alt/php56/usr/share/pear:/opt/alt/php56/usr/share/php') in /home/bas404/public_html/occ-e-filing/PHPMailer/get_oauth_token.php on line 59