Warning: require(vendor/autoload.php): Failed to open stream: No such file or directory in /home/s/smagro/smagro36.ru/public_html/phpmailer/get_oauth_token.php on line 18

Fatal error: Uncaught Error: Failed opening required 'vendor/autoload.php' (include_path='.:/usr/share/php') in /home/s/smagro/smagro36.ru/public_html/phpmailer/get_oauth_token.php:18
Stack trace:
#0 {main}
  thrown in /home/s/smagro/smagro36.ru/public_html/phpmailer/get_oauth_token.php on line 18