laravel 5.4: eloquent-sluggable not works in routes

I have 2 same class/table/controller

In route:list

|        | GET|HEAD  | newsletter/{newsletter}                                     | public.newsletter.show                 | App\Http\Controllers\Mails\NewsLetterController@show

And

|        | GET|HEAD  | bid/{bid}                                                   | public.bid.show                        | App\Http\Controllers\Shops\BidController@show

In model for bid (same for NewsLetter):

use \Cviebrock\EloquentSluggable\Sluggable;
use Illuminate\Database\Eloquent\Model;

class Bid extends Model
{
     use Sluggable;
     ...
     public function sluggable() {
       return [
         'slug'
       ];
     }

Now I can call NewsLetter (news_letters table) by slug But Not for Bid (bids table)

for bids table, I can call it only by Id.

for example this works:

<a href="">newsletter</a>

But not this:

<a href="">bids</a>

But this works:

<a href="">bids</a>

evrythins in tables,web.php,controllers and migration is the same.

what is the wrong?

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