Routing not working in Laravel 5.4

I started a new laravel 5.4 project and the routing doesn't seem to work.

My routes:

Route::group(['prefix' => '/veilingen'], function(){
   Route::resource('/', 'VeilingController');
});

php artisan route:list :

Whenever i populate a URL:

<a href="" class="btn btn-success btn-product">

i got this error:

What am i doing wrong? i was doing it like this all the time and it worked in previous versions.

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