l5-repository 问题？

Target [App\Repositories\UserRepository] is not instantiable while building [App\Http\Controllers\UsersController]
安装.prettus/l5-repository之后按正常操作进行，在请求接口，报错
/**

• UsersController constructor.
• @param UserRepository $repository
• @param UserValidator $validator
  */
  public function __construct(UserRepository $repository, UserValidator $validator)
  {
  $this->repository = $repository;
  $this->validator = $validator;
  }
  ？？？