Target class [] does not exist.
composer dump-autoload
Illuminate\Contracts\Container\BindingResolutionException target calss does not exist
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']);
Illuminate\Contracts\Container\BindingResolutionException Target class [SlugController] does not exist.
Route::get('/test/{slug}', 'App\Http\Controllers\SlugController@show' );