Fatal error: Uncaught Error: Class "Illuminate\Pipeline\Pipeline" not found in C:\xampp\htdocs\adminlte3\vendor\laravel\framework\src\Illuminate\Routing 2\Pipeline.php:16 Stack trace: #0 {main} thrown in C:\xampp\htdocs\adminlte3\vendor\laravel\framework\src\Illuminate\Routing 2\Pipeline.php on line 16