Fatal error: Uncaught Error: Class "Maknz\Slack\Payload" not found in /home/alterna/private_assets.alternalab.it/vendor/alek13/slack/src/AttachmentField.php:4 Stack trace: #0 {main} thrown in /home/alterna/private_assets.alternalab.it/vendor/alek13/slack/src/AttachmentField.php on line 4