Laravel 5.6 - Route not found

I am using Laravel 5.6 and trying to create a simple form to create a post. I have my web routes that looks like this..

Route::resource('posts', 'PostsController')->middleware('auth');

My form looks like this...

<form action="" method="POST">
    <input name="title" type="text">
</form>

And my PagesController looks like this

public function store(Request $request)
    {
        $page = new Page;
        $title = $request->input('title');
        $page->save();
    }

But I am getting the following error message..

Route [pages@store] not defined

Where am I going wrong?

via Chebli Mohamed