i am beginner in programming and in laravel, and i have some issue about my code/project. I want a condition where my main web menu can only be accessed by auth user, but i have an error when make condition in the code. Please help me fix this problem
*ps sory for bad english
here the views
<!DOCTYPE html>
<html lang="en">
<head>
  <title>DOKO MOTOR</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <link rel="stylesheet" href="{{url('/')}}/css/lwd.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
<div id="top-header" style="background:#FFF;height: 100px;"s>
<div id="header" class="hidden-sm hidden-xs">
  <img src="{{url('/')}}/img/logo.png" height="90px" style="position: absolute;">
  <div class="bendera"></div>
              <div class="hotline pull-right">
                  <div class="left"><i class="glyphicon glyphicon-earphone" style="
    font-size: 50px; color:red;
"></i></div>
                    <div class="right">
                    <div class="r-top">hotline :</div>
                        <div class="r-bot">0896 5200 6229</div>
                    </div>
                    <div class="break"></div>
                </div><!-- /.hotline -->
                <div class="top-wel pull-right">Selamat datang di website kami, Jumat, 11 Mei 2018 </div>
</div><!-- /#header -->
</div>
<nav class="navbar navbar-default">
  <div class="container-fluid">
    <div class="navbar-header">
      <a class="navbar-brand" href="{{ url("") }}">DOKO MOTOR</a>
    </div>
    <ul class="nav navbar-nav">
      <!-- @if(Auth::user()) -->
      @if(Auth::user())
      <li class="{{ request()->is('book') ? 'active' : '' }}"><a href="{{ url("book") }}"><span class="glyphicon glyphicon-wrench"></span> Book Service</a></li>
      <!-- @endif -->
      <li class="{{ request()->is('services') ? 'active' : '' }}"><a href="{{ url("services") }}"><span class="glyphicon glyphicon-hourglass"></span> Antrian Service</a></li>
      <li class="{{ request()->is('contact') ? 'active' : '' }}"><a href="{{ url("contact") }}"><span class="glyphicon glyphicon-user"></span> Kontak</a></li>
      <li class="{{ request()->is('tentang') ? 'active' : '' }}"><a href="{{ url("tentang") }}"><span class="glyphicon glyphicon-earphone"></span> Tentang</a></li>
    </ul>
    <ul class="nav navbar-nav navbar-right">
      <!-- @if(Auth::user()) --> 
      <li><a href="{{URL::to('/logout')}}">
      <span style="color: blue"> {{ ucwords(Auth::user()->name) }}</span> <span class="glyphicon glyphicon-log-in"></span> Logout</a></li>
      <!-- @else -->
      @else
      <li><a href="{{URL::to('/register')}}"><span class="glyphicon glyphicon-user"></span> Daftar</a></li>
      <li><a href="{{URL::to('/signin')}}"><span class="glyphicon glyphicon-log-in"></span> Login</a></li>
      <!-- @endif -->
      @endif
    </ul>
  </div>
</nav>
<div class="container">
  @yield('content')
</div>
<div id="footer">
        <div class="row">
          <div class="col-md-12">
              <div class="copy">Copyright © 2018 -  All rights reserved.</div>
            </div>
        </div><!-- /.row -->
</div>
</body>
</html>
here the route
Route::get('/signin', function() {
    return view('login');
});
Route::get('/register/{date?}', function($date = null) {
    return view('register',['date',$date]);
});
Route::post('/register_action/{date?}','RegisterController@store');
Route::post('/login_check','RegisterController@login');
Route::get('logout', function() {
    Auth::logout();
    return Redirect::to('');
})->middleware("auth");
Route::get('/', function(){
    if( auth()->check() ){
        return Redirect::to('/');
    }else{
        return Redirect::to('/auth');   
    }
});
Route::get('/', 'HomeController@index');
Route::get('/contact','ContactController@index');
Route::get('/tentang','TentangController@index');
Route::get('/book/{date?}', 'ServisController@book');
Route::get('/services/{add?}', 'ServisController@services');
Route::post('/submit_book', 'ServisController@submit_book'); 
Route::post('/update_service', 'ServisController@update_service'); 
Route::post('/delete_service', 'ServisController@delete_service');
I'll appreciate anything would help me
Kindly regards
 
    