I have just tried adding a menu item to my site to allow exporting all events. I have a couple of problems. The first is that when I select categories only some categories are shown, most are not.

Secondly, I get an error message when I try to export

Warning: count(): Parameter must be an array or an object that implements Countable in /home/oursitename/public_html/components/com_jevents/views/flatplus/icals/tmpl/ical_form.php on line 40

The link is there but it contains no events.