Fatal error: Uncaught Error: Class "App\Http\Controllers\Controller" not found in C:\xampp\htdocs\Locsy\app\Http\Controllers\admin\Slack\SlackAuthController.php:12 Stack trace: #0 {main} thrown in C:\xampp\htdocs\Locsy\app\Http\Controllers\admin\Slack\SlackAuthController.php on line 12