title: Can't add product to category, category missing - opencart
body: <p>I'm using Opencart 2.0.1.1. I've added a new category with a filter, this is working great.
  Now I want to add a product to that category, I've added the product, but in the Links tab I can't assign the product to the right category, because it is missing.</p>
  
  <p><a href="https://i.stack.imgur.com/2VuGr.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/2VuGr.png" alt="links tab"></a></p>
  
  <p>The newly created category is not showing. What could be the problem? Am I missing something?</p>