Fatal error: Uncaught Error: Class 'GuzzleHttp\Promise\RejectionException' not found in D:\svn\epic-site(사전예약)\default\vendor\guzzlehttp\promises\src\CancellationException.php:7 Stack trace: #0 {main} thrown in D:\svn\epic-site(사전예약)\default\vendor\guzzlehttp\promises\src\CancellationException.php on line 7