Fatal error: Uncaught Error: Class 'Illuminate\Support\ServiceProvider' not found in C:\xampp\htdocs\essay\vendor\brian2694\laravel-toastr\src\ToastrServiceProvider.php:6 Stack trace: #0 {main} thrown in C:\xampp\htdocs\essay\vendor\brian2694\laravel-toastr\src\ToastrServiceProvider.php on line 6