title: 404 error although route exists in laravel 6
body: <p>I have routes like this: <code>Route::resource('admin/post', 'Admin\PostsController');</code>
  Route for edit post exists but I get <code>404</code> error. I list all routes <code>php artisan r:l</code> and it shows me the <code>post.edit</code> but it doesn't show me edit page.</p>
  
  <pre><code>in web.php
    Route::resource('admin/post', 'Admin\PostsController');
  in Admin\PostsController
  public function edit($id)
  {
      $post = Post::findOrFail($id);
      return view('backend.posts.edit', compact('post'));
  }
  </code></pre>
  
  <p>in index.php</p>
  
  <pre><code>&lt;a href="{{route('post.edit', $post-&gt;id)}}" class="btn btn-sx btn-primary"&gt;
                                          &lt;i class="fa fa-edit"&gt;&lt;/i&gt;
                                      &lt;/a&gt;
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/ARhq9.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ARhq9.png" alt="enter image description here"></a></p>
  
  <p>this is the error of edit page
  <a href="https://i.stack.imgur.com/byyYQ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/byyYQ.png" alt="enter image description here"></a></p>