Fatal error: Uncaught Error: Class "App\Http\Controllers\Controller" not found in D:\Apache24\www\qilu_sap\back-end\app\Http\Controllers\Layout\SwitchController.php:9 Stack trace: #0 {main} thrown in D:\Apache24\www\qilu_sap\back-end\app\Http\Controllers\Layout\SwitchController.php on line 9