Fatal error: Uncaught Error: Interface "GuzzleHttp\Promise\PromisorInterface" not found in /home/maborneapp/public_html/sii/vendor/guzzlehttp/guzzle/src/Pool.php:20
Stack trace:
#0 {main}
thrown in /home/maborneapp/public_html/sii/vendor/guzzlehttp/guzzle/src/Pool.php on line 20