Fatal error: Uncaught Error: Class 'Spatie\Backup\Notifications\BaseSender' not found in C:\xampp\htdocs\enercard\vendor\spatie\laravel-backup\src\Notifications\Senders\Slack.php:9 Stack trace: #0 {main} thrown in C:\xampp\htdocs\enercard\vendor\spatie\laravel-backup\src\Notifications\Senders\Slack.php on line 9