Fatal error: Uncaught Error: Class "App\Http\Controllers\Controller" not found in /var/www/html/download-data-laravel-test/app/Http/Controllers/Admin/TransactionReferralController.php:20 Stack trace: #0 {main} thrown in /var/www/html/download-data-laravel-test/app/Http/Controllers/Admin/TransactionReferralController.php on line 20