[Plugin: Rating-Widget] Only empty div is showing

After (hopefully) configuring everything correctly, only an empty div is created in the post. I’ve tried figuring out the solution, but I’m lost.

The div:

<div class="rw-left"><div class="rw-ui-container rw-class-blog-post rw-urid-1200"></div></div>

http://ww.wp.xz.cn/extend/plugins/rating-widget/