Fatal error: Uncaught Error: Interface "GuzzleHttp\Promise\PromiseInterface" not found in /home/alumni/slicks/iswc/vendor/guzzlehttp/promises/src/FulfilledPromise.php:15
Stack trace:
#0 {main}
thrown in /home/alumni/slicks/iswc/vendor/guzzlehttp/promises/src/FulfilledPromise.php on line 15