Warning: require_once(vendor/autoload.php): failed to open stream: No such file or directory in /var/www/spikes-russia.com/data/mailer/PHPMailer/test/bootstrap.php on line 2

Fatal error: require_once(): Failed opening required 'vendor/autoload.php' (include_path='.:/usr/share/php:/usr/share/pear') in /var/www/spikes-russia.com/data/mailer/PHPMailer/test/bootstrap.php on line 2