Fatal error: Uncaught Error: Interface "GuzzleHttp\Promise\PromisorInterface" not found in /home/alumni/slicks/iswc/vendor/guzzlehttp/promises/src/EachPromise.php:13
Stack trace:
#0 {main}
thrown in /home/alumni/slicks/iswc/vendor/guzzlehttp/promises/src/EachPromise.php on line 13