Fatal error: Uncaught Error: Interface "PHPMailer\PHPMailer\OAuthTokenProvider" not found in C:\xampp\htdocs\testrthris\backend\email\PHPMailer\PHPMailer-master\src\OAuth.php:36 Stack trace: #0 {main} thrown in C:\xampp\htdocs\testrthris\backend\email\PHPMailer\PHPMailer-master\src\OAuth.php on line 36