Fatal error: Uncaught Error: Interface "GuzzleHttp\Promise\PromisorInterface" not found in /home/v5ylnh3uow4c/public_html/wp-content/plugins/fv-wordpress-flowplayer/vendor/guzzlehttp/guzzle/src/Pool.php:24 Stack trace: #0 {main} thrown in /home/v5ylnh3uow4c/public_html/wp-content/plugins/fv-wordpress-flowplayer/vendor/guzzlehttp/guzzle/src/Pool.php on line 24