A classe alvo [] não existe.
composer dump-autoload
Iluminar\Contracts\Container\Bindingresolution exception target calss não existe
Routing namespaces have been updated on Laravel 8.X
On your router, you should define:
use App\Http\Controllers\TestController;
And then, declare:
Route::get('test',[TestController::class, 'test']);
Iluminar\Contracts\Container\Bindingresolução Classe-alvo [SlugController] não existe.
Route::get('/test/{slug}', 'App\Http\Controllers\SlugController@show' );