Fatal error: Uncaught Error: Class "GuzzleHttp\Promise\RejectionException" not found in /home/ss294870/masa-web.jp/public_html/webpush.masa-web.jp/vendor/guzzlehttp/promises/src/CancellationException.php:10 Stack trace: #0 {main} thrown in /home/ss294870/masa-web.jp/public_html/webpush.masa-web.jp/vendor/guzzlehttp/promises/src/CancellationException.php on line 10