title: req.flash not showing message
body: <p>I'm using Handlebars in my express project. and I use req.flash() method but it won't Show up in my hbs file.</p>
  
  <p>Here's my Code :</p>
  
  <pre><code> req.flash('message','Tag already exists');
   res.redirect('/p/tags/add');  
  </code></pre>
  
  <p>In .hbs file : </p>
  
  <pre><code>{{#if message}}
  &lt;h1&gt;Tag Already ِExists&lt;/h1&gt;
  {{/if}}
  </code></pre>
  
  <p>Also in my app.js :</p>
  
  <pre><code>app.use(flash());
  </code></pre>
  
  <p>What Seems to be the problem?</p>
  
  <p>Thanks in advance!</p>