TOPIC: [SOLVED] Can't register for events

Every time, I want to register to one of our events, I got the following message:

Before you can register for this event, you must have already registered for the following event(s):

But there are no following events.

What is wrong?

This simply means you have selected a prerequisite category in the setup of your event. There is a multi-select box for prerequisite events and one for prerequisite categories. To de-select it, use CTRL-Click (or Command-Click on a Mac).