Why can't I change category?

Mosets Tree performs a JSON request to your site to request for the list of categories when you change category by clicking on a category name. Here's the format of the URL Mosets Tree uses to perform the request:

<yoursite>/?option=com_mtree&task=ajax&task2=categories.list&cat_id=XX&format=json&is_admin=1&no_html=1&tmpl=component

where <yoursite> is your site's domain and XX is a category's ID.

When you can't change your category, the issue is typically caused by additional output that interfere with the JSON response. Removing these output should resolve the issue.

See This In Demo

This is a sample JSON output from Mosets Tree's demo. It should starts with a opening square bracket and ends with a closing square bracket. It shouldn't have anything before and after those square brackets.