Fatal error: Uncaught Error: Class "Illuminate\Support\ServiceProvider" not found in D:\Application\www\E-Tracking\vendor\laravel\slack-notification-channel\src\SlackChannelServiceProvider.php:9 Stack trace: #0 {main} thrown in D:\Application\www\E-Tracking\vendor\laravel\slack-notification-channel\src\SlackChannelServiceProvider.php on line 9