Fatal error: Uncaught Error: Class "WPMailSMTP\Vendor\League\OAuth2\Client\OptionProvider\PostAuthOptionProvider" not found in /var/www/html/wp-content/plugins/wp-mail-smtp-pro/vendor_prefixed/league/oauth2-client/src/OptionProvider/HttpBasicAuthOptionProvider.php:22 Stack trace: #0 {main} thrown in /var/www/html/wp-content/plugins/wp-mail-smtp-pro/vendor_prefixed/league/oauth2-client/src/OptionProvider/HttpBasicAuthOptionProvider.php on line 22