Fatal error: Uncaught Error: Interface 'PHPMailer\PHPMailer\OAuthTokenProvider' not found in /var/www/sigicov_sign/shared/class_folder/PHPMailer_v6/src/OAuth.php:36 Stack trace: #0 {main} thrown in /var/www/sigicov_sign/shared/class_folder/PHPMailer_v6/src/OAuth.php on line 36