No Event is being triggered

It seems like that no event is being triggered. But the mod itself is loaded and listed on .mods.

Code:

    @Override
    public void onEvent(Event event) {
        System.out.println("Test Event: " + event.toString());
        if(event instanceof EventChatSend) {
            EventChatSend eventChatSend = (EventChatSend) event;
            System.out.println(eventChatSend.getMessage());
            IChat.sendClientMessage("Test");
        }
    }

Doesn't work.