Fatal error: Uncaught Error: Class "App\Http\Controllers\Controller" not found in /home/criativa/public_html/update-to-v2.6/app/Http/Controllers/User/BillingController.php:21 Stack trace: #0 {main} thrown in /home/criativa/public_html/update-to-v2.6/app/Http/Controllers/User/BillingController.php on line 21