does not work in wordpress network blogs?

Hello,

I think “kk star ratings 2.3” it does not work in WordPress network blogs.
I installed it here http://ledhandschuhe.de/fotos/ (at the bottom left) and I can choose the stars but it just says “error” and does not save any ratings.

best wishes
Max

http://ww.wp.xz.cn/extend/plugins/kk-star-ratings/