Fatal error: Uncaught Error: Interface "GuzzleHttp\Promise\PromiseInterface" not found in /home/justin/projects/calsyncv2/calsync/vendor/guzzlehttp/promises/src/RejectedPromise.php:15 Stack trace: #0 {main} thrown in /home/justin/projects/calsyncv2/calsync/vendor/guzzlehttp/promises/src/RejectedPromise.php on line 15