Fatal error: Uncaught Error: Interface "WPMailSMTP\Vendor\GuzzleHttp\ClientInterface" not found in /home/oxygenco/prod/wordpress/wp-content/plugins/wp-mail-smtp/vendor_prefixed/guzzlehttp/guzzle/src/Client.php:16 Stack trace: #0 {main} thrown in /home/oxygenco/prod/wordpress/wp-content/plugins/wp-mail-smtp/vendor_prefixed/guzzlehttp/guzzle/src/Client.php on line 16