Fatal error: Uncaught Error: Interface "GuzzleHttp\Promise\PromisorInterface" not found in /home/salkanta/test.api.salkantay-trekking.com/vendor/guzzlehttp/guzzle/src/Pool.php:21 Stack trace: #0 {main} thrown in /home/salkanta/test.api.salkantay-trekking.com/vendor/guzzlehttp/guzzle/src/Pool.php on line 21