Categories do not appear to be working on my wiki. I have a page called "Test" and I edit it and add the following line to the bottom "[[Category: Testing]]". After saving the page, the category link appears at the bottom like this: "Categories: Testing". When I click 'Testing', however, the category page contains the words "This category currently contains no pages or media." This text appears regardless of whether the 'Testing' Category page has been created or not. I have tried adding multiple pages to a category but with no luck.
PHP 5.5.37 (cgi-fcgi)
Thanks in advance,