Fatal error: Uncaught Error: Interface 'GuzzleHttp\Promise\PromiseInterface' not found in /home/legarden/www/app/plugins/custom-facebook-feed/vendor/guzzlehttp/promises/src/FulfilledPromise.php:11 Stack trace: #0 {main} thrown in /home/legarden/www/app/plugins/custom-facebook-feed/vendor/guzzlehttp/promises/src/FulfilledPromise.php on line 11