What the butons Yes, Maybe, I'm attending are not working

Hello,
I have instaled events+
I have one problem:
buttons No, Maybe, I'm attending not work
http://fishingcafe.pl/events/2013/02/ognisko-integracyjne-uzytkownikow-fishingcafe/

What I am doing wrong?
This is great plugin, and I would like to have fully working

Best regards
Slavomir Kot (Poland)

PS. My name have letter with national glymps in login I have ___