Fatal error: Uncaught Error: Class 'GuzzleHttp\Promise\RejectionException' not found in /home/3kyo4/www/test-spreadsheet-output/vendor/guzzlehttp/promises/src/CancellationException.php:10 Stack trace: #0 {main} thrown in /home/3kyo4/www/test-spreadsheet-output/vendor/guzzlehttp/promises/src/CancellationException.php on line 10