Laravel 5 Target ModelRepository is not instantiable while building [App\Http\Controllers\DataController]

I'm studing about Repository Design Pattern in Laravel and I'm using http://ift.tt/1BVSE6r to do it.

I think i install success in my project . But when i run code with repository i have some problem

BindingResolutionException in Container.php line 748:

Target [App\Repositories\NhanvienRepository] is not instantiable while building [App\Http\Controllers\DataController].

Here in my code

NhanvienRepository.php

<?php

   namespace App\Repositories;

   use Prettus\Repository\Contracts\RepositoryInterface;

   /**
    * Interface NhanvienRepository
    * @package namespace App\Repositories;
    */
   interface NhanvienRepository extends RepositoryInterface
   {
       //
   }

NhanvienRepositoryEloquent.php

<?php

 namespace App\Repositories;

use Prettus\Repository\Eloquent\BaseRepository;
use Prettus\Repository\Criteria\RequestCriteria;
use App\Repositories\NhanvienRepository;
use App\Entities\Nhanvien;
use App\Validators\NhanvienValidator;

/**
 * Class NhanvienRepositoryEloquent
 * @package namespace App\Repositories;
 */
class NhanvienRepositoryEloquent extends BaseRepository implements NhanvienRepository
{
    /**
     * Specify Model class name
     *
     * @return string
     */
    public function model()
    {
        return Nhanvien::class;
    }



    /**
     * Boot up the repository, pushing criteria
     */
    public function boot()
    {
        $this->pushCriteria(app(RequestCriteria::class));
    }
}

DataController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;

use App\Http\Requests;
use App\nhanvien;
use App\Repositories\NhanvienRepository;

class DataController extends Controller
{
    protected $repository;

    public function __construct(NhanvienRepository $repository){
        $this->repository = $repository;
    }

    public function DanhSach(){
        var_dump($this->repository->all());
    }
}

via Chebli Mohamed